Question 1

Which of the following statements about electric field lines is CORRECT?

Accepted Answer

The number of electric field lines per cross-sectional area is proportional to the strength of the electric field in that region.

Question 2

A positive test charge is placed in an electric field. What is the direction of the force acting on it?

Accepted Answer

In the direction of the electric field lines.

Question 3

At electrostatic equilibrium, what is true about the electric field inside a conductor?

Accepted Answer

It is zero everywhere inside the conductor.

Question 4

A hollow, electrically neutral, spherical conductor has a charge $$+q$$ suspended at its center. What charge is induced on the interior and exterior surfaces?

Accepted Answer

(a) $$-q on $$the interior, $$+q on $$the exterior

Question 5

Which of the following best describes the electric potential at a point?

Accepted Answer

The potential energy per unit charge at that point.

Question 6

A $$4.0 	imes 10$$^{-9}$$ C charge is placed on each plate of a parallel-plate capacitor with area 0.01$ m^2$ and plate separation 1.0$ mm. What is the potential difference between the plates? ($$\$$varepsilon_0 = 8.85$$ 	imes $$10^{-12} C$^2/N$$·m$$^2)$$

Accepted Answer

$$-4.5 V$$

Question 7

Which of the following is TRUE about the work done by the electric field when moving a charge from point A to point B?

Accepted Answer

It equals the negative change in electric potential energy: $$W_{AB} = EPE_A - EPE_B$$

Question 8

A positive charge is released from rest at a point of higher electric potential. What happens to its kinetic and potential energy as it moves?

Accepted Answer

Its kinetic energy increases and its potential energy decreases.

Question 9

Calculate the electric potential at a point $$1.2 m $$away from a point charge of $$+4.0 	imes 10$$^{-9}$$ C. (k = 8.99$$ 	imes $$10^9 N$$·m$$^2/C$^2)$$

Accepted Answer

$$+300 V$$

Question 10

Which of the following is a correct statement about the electron-volt (eV)?

Accepted Answer

It is the energy gained by an electron moving through a potential difference of one volt.

Question 11

A Van de Graaff generator accelerates an electron from rest across a $$+100,000 V $$potential difference. What is the change in electric potential energy of the electron? ($$q = -1.6 	imes 10$$^{-19}$$ C)

Accepted Answer

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

Question 12

Two point charges, $$+8.0 	imes 10$$^{-9}$$ C and -8.0$$ 	imes $$10^{-9} C$$, are separated by $$0.40 m. $$What is the electric potential at the midpoint between them?

Accepted Answer

$$0 V$$

Question 13

Which of the following best describes the behavior of a negative test charge in an electric field?

Accepted Answer

It accelerates from a region of lower potential to higher potential.

Question 14

What is the potential difference $$V_{BA}$$ between two points A and B if the work done by the electric field in moving a $$2.0 	imes 10$$^{-6}$$ C charge from A to B is -5.0$$ 	imes $$10^{-5} J$$?

Accepted Answer

$$-25 V$$

Question 15

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

Accepted Answer

They can form closed loops in free space.

Question 16

A positive test charge is moved from point A to point B in a uniform electric field. Which of the following is true?

Accepted Answer

The work done by the field is independent of the path taken.

Question 17

If the electric potential at point A is $$120 V $$and at point B is $$80 V$$, what is the change in electric potential energy for a $$3.0 	imes 10$$^{-6}$$ C charge moved from A to B?

Accepted Answer

$$-1.2 	imes 10$$^{-4}$$ J

Question 18

Which of the following devices can produce the highest electric potential difference?

Accepted Answer

A large Van de Graaff generator

Electric Fields and Electric Potential: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards