Question 1

Which statement best describes the electric field between the plates of a parallel-plate capacitor, as shown in the first image?

Accepted Answer

The electric field is uniform between the plates and points from the positive to the negative plate.

Question 2

In the second image, which depicts a hollow spherical conductor, what is true about the electric field inside the conductor under electrostatic equilibrium?

Accepted Answer

The electric field inside the conductor is zero everywhere.

Question 3

Refer to the Van de Graaff generator diagram (third image). What is the primary function of the belt in this device?

Accepted Answer

To transfer positive charges to the metallic sphere at the top.

Question 4

A positive test charge is released from point A in the fourth image and accelerates toward point B. What will a negative test charge do if released from rest at point B?

Accepted Answer

It will accelerate toward point A, moving to higher potential.

Question 5

Which equation correctly relates the electric potential difference to the work done by the electric field on a charge $$q_0$$?

Accepted Answer

$$\Delta V = -\frac{W_{BA}}{q_0$}$$

Question 6

A Van de Graaff generator accelerates an electron across a potential difference of $$100,000\ V. $$What is the change in electric potential energy of the electron?

Accepted Answer

$$1.6 	imes 10$$^{-14}$$\ J$$

Question 7

If a charge $$q is $$placed at a distance $$r$$ from a point charge $$Q$$, what is the electric potential at that point due to $$Q$$?

Accepted Answer

$$V = \frac{kQ}{r}$$

Question 8

In the seventh image, a positive point charge increases the electric potential at a spot 1.2 m away. What would a negative point charge of the same magnitude do at the same spot?

Accepted Answer

It would decrease the electric potential by the same amount.

Question 9

Two point charges, $$+8.0 	imes 10$$^{-9}$$\ C$$ and $$-8.0 	imes 10$$^{-9}$$\ C$$, are separated by 0.80 m. What is the electric potential at the midpoint between them?

Accepted Answer

$$0\ V$$

Question 10

A parallel-plate capacitor has plates separated by $$1.0\ mm$$, area $$0.01\ m^2$, and charge 4.0$$\ nC$$ on each plate. What is the potential difference between the plates?

Accepted Answer

$$-45\ V$$

Question 11

Which of the following is true about electric field lines?

Accepted Answer

They begin on positive charges and end on negative charges.

Question 12

A positive charge accelerates from a region of higher electric potential to a region of lower electric potential. What happens to its electric potential energy?

Accepted Answer

It decreases.

Question 13

Which of the following is the correct SI unit for electric potential?

Accepted Answer

Volt

Question 14

If the electric field inside a conductor is zero, what happens to any excess charge placed on the conductor?

Accepted Answer

It resides on the surface of the conductor.

Question 15

A negative charge accelerates from a region of lower potential to a region of higher potential. What is the direction of the electric force acting on it?

Accepted Answer

Toward higher potential.

Question 16

Which equation gives the change in electric potential energy for a charge $$q$$ moving through a potential difference $$\Delta V$$?

Accepted Answer

$$\Delta EPE = q \Delta V$$

Question 17

Which of the following is NOT a property of electric field lines?

Accepted Answer

They can stop in midspace.

Question 18

A charge $$+2q$$ and a charge $$-q$$ are fixed in place. On the line passing through the charges, how many places are there where the total potential is zero?

Accepted Answer

Two

Question 19

Which of the following best describes the shielding effect of a conductor?

Accepted Answer

A conductor prevents external electric fields from affecting charges inside it.

Question 20

If the work done by the electric field in moving a charge $$q_0$$ from point A to point B is $$+5.0 	imes 10$$^{-5}$$\ J$$, and $$q_0 = +2.0$$ 	imes $$10^{-6}$$\ C$$, what is the potential difference V_B - V_A$?

Accepted Answer

$$-25\ V$$

lec 3

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