Question 1

Which of the following best describes Coulomb's Law for the force between two point charges $$q_1$$ and $$q_2$$ separated by a distance $$r$$?

Accepted Answer

$$F = k_e \frac{q_1$ q_2$}{r^2$}$$

Question 2

A charged particle is placed in a uniform electric field $$\vec{E}. $$What is the force $$\vec{F}$$ acting on the particle if its charge is $$q$$?

Accepted Answer

$$\vec{F} = q\vec{E}$$

Question 3

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

Accepted Answer

Electric field lines start on positive charges and end on negative charges.

Question 4

A parallel-plate capacitor has plates separated by a distance $$d$$ and a potential difference $$V$$ across them. What is the magnitude of the electric field $$E$$ between the plates?

Accepted Answer

$$E = \frac{V}{d}$$

Question 5

Which of the following is the correct expression for the electric potential $$V$$ due to a point charge $$q at a $$distance $$r$$?

Accepted Answer

$$V = k_e \frac{q}{r}$$

Question 6

A sphere of charge $$Q$$ creates an electric field outside the sphere. At a distance $$r$$ from the center (where $$r is $$greater than the radius of the sphere), what is the electric field $$E$$?

Accepted Answer

$$E = k_e \frac{Q}{r^2$}$$

Question 7

Which of the following best describes the electric field inside a conductor in electrostatic equilibrium?

Accepted Answer

The electric field is zero everywhere inside the conductor.

Question 8

A dipole is placed in a uniform electric field. What is the torque $$	au$$ experienced by the dipole if its dipole moment is $$p$$ and the field makes an angle $$	heta$$ with $$p$$?

Accepted Answer

$$	au = pE \sin	heta$$

Question 9

Which of the following is a correct statement about the superposition principle for electric fields?

Accepted Answer

The net electric field at a point is the vector sum of the electric fields produced by each charge.

Question 10

A charged particle moves from point A to point B in an electric field. The electric potential at A is higher than at B. What can be said about the work done by the electric field?

Accepted Answer

The electric field does positive work on the particle if it is positive.

Question 11

Which of the following is the correct expression for the electric field due to an infinite plane of charge with surface charge density $$\sigma$$?

Accepted Answer

$$E = \frac{\sigma}{2\$$varepsilon_0$$}$$

Question 12

A point charge $$q is $$placed at the center of a spherical conducting shell. What is the electric field inside the shell (but outside the center charge)?

Accepted Answer

Zero, because the shell cancels the field inside.

Question 13

Which of the following is true about equipotential surfaces?

Accepted Answer

The electric field is always perpendicular to equipotential surfaces.

Question 14

A line of charge has a linear charge density $$\lambda. $$What is the electric field a distance $$r$$ from the line?

Accepted Answer

$$E = \frac{2k_e \lambda}{r}$$

Question 15

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

Accepted Answer

Volt (V)

Question 16

A parallel-plate capacitor is charged and then disconnected from the battery. If the plates are pulled farther apart, what happens to the potential difference between the plates?

Accepted Answer

It increases.

Electric Forces, Fields, and Potential: Study Notes for Physics with Calculus

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