Electrons are made to flow in a wire when there is
A) an imbalance of charges in the wire.
B) more potential energy at one end of the wire than the other.
C) a potential difference across its ends.

Answer:

The maximum height of soccer ball  is 12.25 ft.

Explanation:

You know: H(t) = −16t² + vt + s

First you must know the value of the constant "s". For this you know that at the beginning, at time t = 0, the initial height H (0) is zero. Also, you know that the speed v is 28 feet per second. So:

H(0)=-16*0² + 28*0 + s

0=-16*0² + 28*0 + s

0=s

Then, the speed expression is determined as:

H(t) = −16t² + 28*t

The vertex is a point that is part of the parabola, which has the value as ordered  minimum or maximum function. At that point an imaginary axis can be drawn that makes  symmetric the graph of the function, which is called the axis of symmetry.

Being the parabola:  f(x)=a*x² + b*x + c

the vertex is calculated as: [tex](x,y)=(\frac{-b}{2*a} ,f(\frac{-b}{2*a}))[/tex]

In this case,  the point "x" of the vertex indicates the time at which the soccer ball reaches the maximum "y" height ( The vertex is at a maximum point of the function.) So, being a=-16 and b=28, the vertex is:

[tex]x=\frac{-b}{2*a} =\frac{-28}{2*(-16)}[/tex]

x=0.875

H(0.875)=-16*(0.875)²+28*(0.875)=12.25

The maximum height of soccer ball  is 12.25 ft.

Answer:

37.65

Explanation:

50/4 + 74/2

If a train travels 50 kilometers in 4 hours, and then 74 kilometers in 2 hours its average speed is 24.75 km / hr.

Explanation:

Speed is related to the ratio of distance and time. Speed = Distance / time.

Speed of the first train = 50 / 4 = 12.5 km / hr

Speed of the second train = 74 / 2 = 3 7 km / hr

Average speed = (12.5 + 3 7 ) / 2 = 24.75 km / hr

So the average speed of the train is 24.75 km / hr.

Answer:

Pushing magma up through the interior of earth

Explanation:

Final answer:

The direction and interaction of a magnetic force on a moving electric charge in a magnetic field.

Explanation:

The statements that are true regarding a magnetic force acting on an electric charge in a uniform magnetic field are:

Therefore, statements 1, 2, 3, and 4 are true.

Answer:

28.8 %

Explanation:

The efficiency of an engine is given by:

[tex]\eta = \frac{W}{Q_{in}}[/tex]

where

W is the useful work done

[tex]Q_in[/tex] is the heat in input

For this machine, we have

W = 15.0 kJ is the work done

[tex]37.0 kJ[/tex] is the heat exchausted to the cold reservoir, so the total amount of heat in input is

[tex]Q_{in} = 15.0 kJ + 37.0 kJ=52.0 kJ[/tex]

And so the efficiency is

[tex]\eta=\frac{15.0 kJ}{52.0 kJ}=0.288[/tex]

which corresponds to 28.8 %.

The efficiency of an engine is calculated by dividing the work output by the total energy input. In this case, the engine has an efficiency of 28.8%.

The efficiency of an engine can be calculated by the ratio of the work output to the heat input. In this case, the work output done by the engine is 15.0 kJ, and the heat input is the total energy supplied to the engine which is the sum of the work done (15.0 kJ) and the energy exhausted to the cold reservoir (37.0 kJ), giving a total of 52.0 kJ. Thus, the efficiency of the engine can be found by dividing the work done by the total energy supplied, or (15.0 kJ)/(52.0 kJ) = 0.288, or 28.8%.

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Piano tuners use frequency differences and beat frequencies to tune pianos.

(a) The frequency of the third harmonic of A can be calculated by multiplying the fundamental frequency of A (440 Hz) by 3, resulting in a frequency of 1320 Hz. The frequency of the second harmonic of E can be calculated by multiplying the fundamental frequency of E (659 Hz) by 2, which is 1318 Hz. To find the frequency difference between the two, subtract the second harmonic of E from the third harmonic of A: 1320 Hz - 1318 Hz = 2 Hz.

(b) When the tuner strikes the A and E strings simultaneously, she listens for beats between the harmonics. The beat frequency indicates that the E string is properly tuned. The beat frequency is equal to the difference between the frequencies of the harmonics. In this case, the beat frequency would be 2 Hz.

(c) When the tuner hears four beats per second, it means there is a beat frequency of 4 Hz between the harmonics. To find the frequency of the E string, we can use the formula: Beat Frequency = Frequency of Higher Harmonic - Frequency of Lower Harmonic. Rearranging the formula, we get: Frequency of Higher Harmonic = Beat Frequency + Frequency of Lower Harmonic. Plugging in the values, we get: Frequency of Higher Harmonic = 4 Hz + 659 Hz = 663 Hz.

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Answer:

A

Explanation:

Answer:

i think d

Explanation:because concave and convex mirrors have f negative value

Answer:

B and D   ( c )

Explanation:

The optical devices that have f ( focal length ) as negative is the diverging lens ( image b ) and a convex mirror ( image d ).

An optical device is said to have a negative focal length when the image been focused or viewed on it appears on the same side as with the object been viewed as this is observed  when images are viewed through a diverging lens ( image b ) and also when an image is viewed through a convex mirror ( image d ). when an image is viewed through an optical device and the image appears on the opposite side the optical device is a said to have a positive focal length ( f )  

the negative f ( focal length ) means that the focal point of the optical device is on the same side of the lens as with where the object is placed

answer:

heating the material

placing the material in a magnetic field of opposite polarity

hitting the material

Answer: heating, placing in a strong magnetic field, Placing in an electric field.

Explanation: Placing the material in an electric field.

Heating the material. Raising the temperature of the material.

Place the material in a magnetic field that is basically of opposite polarity.

Physically hitting of the material.

The location of the center of our Galaxy was first determined by observations of Globular Clusters

Answer:

0.23 s

Explanation:

First of all, let's find the time constant of the circuit:

[tex]\tau=RC[/tex]

where

[tex]R=50,000 \Omega[/tex] is the resistance

[tex]C=2.0\mu F=2.0\cdot 10^{-6}F[/tex] is the capacitance

Substituting,

[tex]\tau=(50,000 \Omega)(2.0\cdot 10^{-6}F)=0.1 s[/tex]

The charge on a charging capacitor is given by

[tex]Q(t)=Q_0 (1-e^{-t/\tau} )[/tex] (1)

where

[tex]Q_0[/tex] is the full charge

we want to find the time t at which the capacitor reaches 90% of the full charge, so the time t at which

[tex]Q(t)=0.90 Q_0[/tex]

Substituting this into eq.(1) we find

[tex]0.90 Q_0 = Q_0 (1-e^{-t/\tau})\\0.90=1-e^{-t/\tau}\\e^{-t/\tau}=1-0.90=0.10\\-\frac{t}{\tau}=ln(0.10)\\t=-\tau ln(0.10)=(0.1 s)ln(0.10)=0.23 s[/tex]

The time it takes for the capacitor to reach 90% of full charge is approximately 0.23 seconds.

To calculate the time it takes for the capacitor to reach 90% of full charge, we need to use the time constant equation, which is given by t = RC. In this case, the resistance is 50,000 ohms and the capacitance is 2.0 µF. Multiplying these values gives us a time constant of 0.1 seconds.

To find the time it takes for the capacitor to reach 90% of full charge, we multiply the time constant by 2.3, which is the natural logarithm of 0.9. So the time it takes for the capacitor to reach 90% of full charge is approximately 0.23 seconds.

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Opaque materials absorb all the light that shines on them.  None of it comes out the other side.  That's why they're opaque.

Opaque materials become warmer when light shines on them, because they absorb the energy carried by the light that shines on them.  (According to the law of Conservation of Energy, that energy has gotta go somewhere.)

Opaque materials become warmer when light shines on them due to the absorption of light energy by the atoms and molecules of the material.

Opaque materials become warmer when light shines on them due to the absorption of light energy. When light hits an opaque material, the photons from the light wave interact with the atoms and molecules of the material. These interactions cause the atoms and molecules to vibrate, generating heat energy and resulting in an increase in temperature.

For example, when sunlight shines on a black, opaque surface, the surface absorbs most of the light energy. The absorbed energy causes the atoms and molecules of the surface to vibrate, leading to an increase in temperature.

In contrast, transparent materials, such as glass, allow light to pass through them without significant absorption. As a result, they do not become as warm when light shines on them.

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Answer:

Nuclear reaction

Hope this helps! =)

Explanation:

Explanation:

A chemical reaction is defined as the reaction that involves exchange of electrons between the reacting atoms.

For example, [tex]2Na(s) + Cl_{2}(g) \rightarrow 2NaCl[/tex]

Mass of Na = 23 g/mol

Mass of Cl = 35 g/mol

Mass of NaCl compound = (23 + 35) g/mol = 58 g/mol

So, in chemical reactions law of conservation of mass is obeyed because mass of reacting species is changing from one form to another.

Whereas in nuclear reactions there is splitting or combining of atomic nuclei of atom(s). Since, nuclei is involved in nuclear reaction so more energy is required.

Also, E = [tex]mc^{2}[/tex] so, in nuclear reactions mass of reacting atoms changes into energy. This results in formation of larger amount of energy.

Therefore, we can conclude that in situations involving equal masses, chemical reactions produce less energy than nuclear reactions.

Answer:

[tex]4.8\cdot 10^{-21} N[/tex]

Explanation:

The force exerted by a magnetic field on a charged particle is given by

[tex]F=qvB[/tex]

where

q is the charge of the particle

v is the speed

B is the magnetic field strength

In this problem we have:

[tex]B = 0.20 T[/tex] is the strength of the magnetic field

[tex]v = 15 cm/s = 0.15 m/s[/tex] is the velocity

[tex]q=e = 1.6\cdot 10^{-19}C[/tex] is the magnitude of the charge of a single chlorine ion

Substituting into the equation,

[tex]F=(1.6\cdot 10^{-19} C)(0.15 m/s)(0.20 T)=4.8\cdot 10^{-21} N[/tex]

The force felt by a chlorine ion with a single negative charge flowing through a coronary artery under a magnetic field of 0.20 T can be calculated using the Lorentz force law. Given that the velocity of the blood flow is 15 cm/s, the calculated force is -4.8 * 10^-21 N. The negative sign indicates that the force acts in the direction opposite to the magnetic field.

In Physics, the force exerted by a magnetic field on a charged particle like a chlorine ion is given by the Lorentz force law, which states F = qvBsinθ. In this equation, 'F' is the magnetic force, 'q' is the charge of the particle, 'v' is the velocity of the particle, 'B' is the magnetic field strength, and 'θ' is the angle between the velocity and magnetic field vectors.

In your case, the chlorine ion has a single negative charge (q = -1.6 * 10^-19 C), the velocity of the blood flow is given as 15 cm/s (convert this to m/s by multiplying by 0.01 to give v = 0.15 m/s), and the magnetic field strength is 0.20 T. Assuming the flow of blood is perpendicular to the magnetic field, the angle θ = 90° so sinθ = 1.

Substituting these values into the Lorentz force equation gives F = (-1.6 * 10^-19 C) * (0.15 m/s) * (0.20 T) * 1 = -4.8 * 10^-21 N. The negative sign indicates the force acts opposite to the direction of the magnetic field.

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Answer:

The three laws of motion were first compiled by Isaac Newton in his Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), first published in 1687.

Explanation:

Answer:jyjyjjhjh

Explanation:

hjjhjhjhjjh

The answer is through light.

Light is unique it carries information it has no mass and it is insanely fast.

But what is light?

You can imagine it as a stream of photons (elementary particles) traveling from its source to surface of an object with a speed of light where they bounce of your eye. That very moment the information of a single photon in a form of energy is transmitted to your eyes and later on to your brain which processes the gathered information and constructs an image.

When you turn on the light you know that all the photons are coming from it the same thing is with nonanthropogenic light (natural light) we get about 99% from the sun and about 1% from the moon at night.

In the core of our sun elements are fused to make up heavier elements in this process energy is released (E=mc^2, where E is energy, m mass of a single atom fused inside star and c^2 the square of speed of light) in a form of photons and the type of photon (its frequency) determines if it will be visible to our eye and also determines the type of luminosity of stars.

Also if you were to track every single bit of information carried by any photon any time you would unravel the unfolding of the universe from the big bang to today.

Answer:

0.39

Explanation:

In order not to slide, you must have exactly the same acceleration of the train:

[tex]a=0.39 g[/tex]

where

g = 9.81 m/s^2

There is only one force acting on you: the static frictional force that "pulls" you forward, and it is given by

[tex]F_s = \mu_s mg[/tex]

According to Newton's second law, the net force acting on you (so, the frictional force) must be equal to your mass times the acceleration, so we have

[tex]F= ma = \mu_s mg[/tex]

from which we find

[tex]\mu_s = \frac{a}{g}=\frac{0.39 g}{g}=0.39[/tex]

so, the minimum coefficient of static friction must be 0.39.

The minimum coefficient of static friction required to prevent slipping on a train accelerating at 0.39g must be equal to or greater than 0.39.

To calculate the minimum coefficient of static friction required to prevent you from sliding on a train accelerating at 0.39g (where g is the acceleration due to gravity), you need to understand the relationship between static friction (Fs) and the normal force (N). Let's denote the coefficient of static friction as μs. The maximum force of static friction (μsN) should be equal to or greater than the force needed to overcome the train's acceleration to avoid slipping.

Since the acceleration of the train is 0.39g, and g is 9.81 m/s² (the acceleration due to gravity), the force due to the train's acceleration can be expressed as 0.39 × your mass × g. Considering that your mass × g gives us the normal force (N), the equation to avoid slipping becomes:

Fs ≥ 0.39 × N

Substituting the force of static friction equation (Fs = μs × N), we get:

μs × N ≥ 0.39 × N

Since N appears on both sides of the inequality, they cancel each other out, and you are left with:

μs ≥ 0.39

This means the minimum coefficient of static friction must be 0.39 or greater to prevent sliding.

An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet.  

As a result, the object's mass remains the same, and its weight decreases to 1/4 of whatever it is when the object is on the planet's surface.

Correct Answer is D.

The other answers do not make sense. Imagine this. You break a magnet in half. All it does is become a smaller magnet.

You are working with a magnet and it breaks in half. You then end up with  two magnets, each with a south and a north pole (D).

Answer:

The first flowering plants appeared in the Mesozoic era, not the Paleozoic era

Explanation:

The Mesozoic era is well known and most famous because of the rule of the dinosaurs which were the dominant animals for most of this are. Also, it is the era in which the mammals appeared, though they lived in the shadows of the dinosaurs and only became dominant after their extinction. Another important evolution that took place and is not mentioned very often is the appearance of the first flowering plants. This was a revolutionary trait for the plants, and it helped them to survive in the changing climate on Earth. Soon this trait enabled this type of plants to spread out significantly and to become one of the most dominant organisms on the planet in the following era.

Answer: The answer is A

Explanation:

Electronegativity is the ability to attract electrons. The periodic trend for electronegativity increases up a column and from left to right along a row. Which means that main group metals have low electronegativity and the transition metals have low to medium electronegativity and a small number of valence electrons. Which then leads the metals to not hold on to their valence electrons very tightly and to lose them easily forming cations.  So low electronegativity means high metallic character.

Answer:

Layer C

Explanation:

The Principle of faunal succession also is the study of fossils

Their for making the answer A

Answer:

521 nm

Explanation:

Given the values and units we are given, I'm assuming  5.76*10^14 Hz is frequency.

The formula to use here is λ * υ = c, where λ is wavelength, υ is frequency, and c is the speed of light.

λ = [tex]\frac{3*10^8\frac{m}{s} }{5.76*10^{14}Hz} = {5.20833*10^{-7} m}\approx{521 *10^{-9}m}={521 nm}[/tex]

a. 0.5 T

- The amplitude A of a simple harmonic motion is the maximum displacement of the system with respect to the equilibrium position

- The period T is the time the system takes to complete one oscillation

During a full time period T, the mass on the spring oscillates back and forth, returning to its original position. This means that the total distance covered by the mass during a period T is 4 times the amplitude (4A), because the amplitude is just half the distance between the maximum and the minimum position, and during a time period the mass goes from the maximum to the minimum, and then back to the maximum.

So, the time t that the mass takes to move through a distance of 2 A can be found by using the proportion

[tex]1 T : 4 A = t : 2 A[/tex]

and solving for t we find

[tex]t=\frac{(1T)(2 A)}{4A}=0.5 T[/tex]

b. 1.25T

Now we want to know the time t that the mass takes to move through a total distance of 5 A. SInce we know that

- the mass takes a time of 1 T to cover a distance of 4A

we can set the following proportion:

[tex]1 T : 4 A = t : 5 A[/tex]

And by solving for t, we find

[tex]t=\frac{(1T)(5 A)}{4A}=\frac{5}{4} T=1.25 T[/tex]

The time it takes for the mass to move through a distance of 2A is 2 times the period T, and the time it takes for the mass to move through a distance of 5A is 5 times the period T.

In terms of T, the time it takes for the mass to move through a total distance of 2A is:

t/T = 2

The time it takes for the mass to move through a total distance of 5A is:

t/T = 5

These equations show that the time it takes for the mass to move through a total distance is proportional to the number of times the amplitude is covered. Therefore, if the distance is 2A or 5A, it will take 2 or 5 times the period T, respectively.

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Answer:

An element may have several isotopes that contain different numbers of NEUTRONS but the same number of PROTONS.

Explanation:

Isotopes are defined as the group of such atoms which will have same number of protons but different number of neutrons

So this is basically same atoms but with different number of neutrons

So here we can sat

[tex]_1^1H , _1^2H , _1^3H[/tex]

above are three isotopes of hydrogen

similarly we have many more examples of isotopes in which the atoms are of same type but with different number of neutrons

so here correct answer will be

An element may have several isotopes that contain different numbers of NEUTRONS but the same number of PROTONS.

Final answer:

Isotopes of an element differ in the number of neutrons they have but have the same number of protons. Answer B) neutrons, protons, is correct for the given question on the nature of isotopes.

Explanation:

An element may have several isotopes that contain different numbers of neutrons but the same number of protons. The correct answer to the question is B) neutrons, protons.

Isotopes are variants of a particular chemical element, which while having the same number of protons, differ in the number of neutrons they possess. Thus, isotopes of an element have identical atomic numbers (representing the number of protons) but different mass numbers (representing the total number of protons and neutrons). This variation in the number of neutrons does not affect the chemical properties of an element, as these properties are primarily determined by the number of protons and electrons, which are the same in all isotopes of an element.

A) Upward

In order to find the direction of the magnetic force on the wire, we can use the right-hand rule: the index finger, the middle finger and the thumb of the right hand must be placed all of them perpendicular to each other.

So we have:

- Index finger: direction of current in the wire (from west to east)

- Middle finger: direction of magnetic field (from south to north)

- Thumb: direction of the force --> so it will be upward

So, the force will point upward.

B) [tex]1.82\cdot 10^{-4}N[/tex]

The magnitude of the force exerted by the magnetic field on the wire is given by

[tex]F=ILB[/tex]

where

I = 1.50 A is the current in the wire

L = 2.20 m is the length of the wire

[tex]B=0.550 G = 0.55 \cdot 10^{-4}T[/tex]

Substituting into the equation, we find

[tex]F=(1.50 A)(2.20 m)(0.55 \cdot 10^{-4} T)=1.82\cdot 10^{-4}N[/tex]

Final answer:

The force exerted by the Earth's magnetic field on a wire carrying current from west to east is directed upwards. To determine the magnitude of the force, use the formula F = I × L × B × sin(θ) and calculate it to be approximately 0.1815 mN, where I represents current, L length, and B magnetic field.

Explanation:

The student's question involves finding the direction and magnitude of the force exerted by the Earth's magnetic field on a current-carrying wire oriented from west to east. To solve this, we use the right-hand rule for the direction and the formula F = I × L × B × sin(θ) for the magnitude.

Force Direction

Part A asks for the direction of the force. We apply the right-hand rule which indicates that if you point your thumb in the direction of current (from west to east, which is left to right) and your fingers in the direction of the magnetic field (from south to north, or bottom to top), your palm will face towards the direction of the force exerted on the wire. As the current flows from west to east and the Earth's magnetic field goes from south to north, the force on the wire will be directed upwards.

Force Magnitude

Part B asks for the magnitude of the force. The formula we use is F = I × L × B × sin(θ), where F is the force, I is the current (1.50 A), L is the length of the wire (2.20 m), B is the magnetic field, which should be converted from gauss to tesla (1 gauss = 1×10⁻⁴ tesla, so 0.550 gauss = 5.50×10⁻⁵ T), and θ is the angle between the wire and the magnetic field (90° here). With these values, we can calculate the force.

Let's calculate the force:
F = 1.50 A × 2.20 m × 5.50 × 10⁻⁵T × sin(90°)
F = 1.50 × 2.20 × 5.50 × 10⁻⁵ N
F = 0.1815 × 10⁻³ N
F ≈ 0.1815 mN

Answer:

= 2.83

Explanation:

F number (N) is given by the formula;

  F- number = f/D

where f = focal length of lens and D = diameter of the aperture  

Therefore;

F number = 17 cm/6 cm

                = 2.83

The number of the television camera lens with focal length 17 cm and lens diameter 6.0 meter is 2.83.

The focal length of the lens is the length of the distance between the middle of the lens to the focal point.

It can be find out using the following formula as,

[tex]f=d\times n[/tex]

Here, (c)is the diameter the lens and, (n) is the number of the lens. This formula can be written as,

[tex]n=\dfrac{f}{d}[/tex]

The television camera lens has a 17-cm focal length and a lens diameter of 6.0 cm. Thus put this values in the above formula as,

[tex]n=\dfrac{17}{6}\\n=2.83[/tex]

Thus, the number of the television camera lens with focal length 17 cm and lens diameter 6.0 meter is 2.83.

Learn more about the focal length here;

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1. the change in position of an object from start to finish, a vector quantity . . . . . displacement

2. a portion of space that contains a value for a measurable quantity at every point in space . . . . . field

3. speed = (distance) / (time to cover the distance)

4. the length of the entire path an object travels from start to finish . . . . . distance

5. a measurement that has both magnitude and direction . . . . . vector

6. a change in displacement with respect to time . . . . . velocity

7. a mental or physical construct or description that describes a physical phenomenon . . . . . model

8. a change in velocity with respect to time . . . . . acceleration

9. a measurement that only expresses magnitude, such as time, temperature, distance, and speed . . . . . scalar

10. objects that are thrown or launched in the air and are subject to gravity . . . . . projectile

Here we want to complete different statements about dynamics, the solutions are:

So most of these are just definitions, so not a lot can be told about some of the answers, but I will try to develop each one as I can.

1) "the change in position of an object from start to finish, a vector quantity model"

By definition, this is the displacement, the change in between the final and initial position.

2) "a portion of space that contains a value for a measurable quantity at every point in space"

This is a field, it refers to the measure of something (magnetic field, electric field, etc) in a given position in space.

3) "speed = distance/time"

Speed is defined as the quotient between the distance traveled and the time it takes to travel that distance.

4) "the length of the entire path an object travels from start to finish projectile"

This is defined as the "travel distance"

5) "a measurement that has both magnitude and direction"

A vector is a measurement with both magnitude and direction.

6) "a change in displacement with respect to time"

A change in the displacement with respect to time is the velocity, it comes from point 3.

7) "a mental or physical construct or description that describes a physical phenomenon"

This is a model, is just an explanation of a given phenomenon

8) "a change in velocity with respect to time"

The rate of change of velocity with respect to time is the acceleration.

9) "a measurement that only expresses magnitude, such as time, temperature, distance, and speed"

This is a scalar, is a measurement that only has magnitude, not direction.

10) "objects that are thrown or launched in the air and are subject to gravity"

This is a projectile, or more exactly, a free-falling object, if we only look at the vertical problem.

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i belive the answer is B

Resistors 'C' and 'D' are in series.  There's only one possible route for current to flow through them.  Every electron that flows through one of them has to flow through the other one.  So the current (amount of charge per second) must be the same in 'C' and 'D'. (answer-choice B)

The following symbol is used to represent cell (batery) in a circuit diagram.

D is correct

+ - is battery

you got right