Question 1

Which of the following statements best describes the Law of Conservation of Electric Charge?

Accepted Answer

The net amount of charge produced by any process is always zero.

Question 2

A hydrogen atom consists of a proton and an electron separated by $$r = 0.53 	imes 10$$^{-10}$$ m. What is the magnitude of the electrostatic force between them? (Use e = 1.6$$ 	imes $$10^{-19} C$$, $$k = 9.0 	imes 10^9$ N·m^2$/C^2$)

Accepted Answer

$$8.2 	imes 10$$^{-8}$$ N$

Question 3

Which of the following materials is most likely to be a good electrical conductor?

Accepted Answer

Copper

Question 4

If two point charges, $$+Q$$ and $$+4Q$$, are separated by a distance $$d$$, where should a third charge $$q be $$placed on the line between them so that the net force on $$q is $$zero?

Accepted Answer

At a point closer to $$+Q$$ than $$+4Q$$, specifically at $$x = d/5$$ from $$+Q$$

Question 5

A charged rubber balloon sticks to a wall. What is the best explanation for this phenomenon?

Accepted Answer

The balloon induces polarization in the wall, causing opposite charges to attract.

Question 6

What is the definition of the electric field at a point in space?

Accepted Answer

The force per unit charge at that point.

Question 7

A positive test charge is placed in an electric field. Which direction does it move?

Accepted Answer

In the direction of the electric field.

Question 8

If the charge of a point source is doubled and the distance from the source is also doubled, by what factor does the electric field strength change?

Accepted Answer

$$1/4$$

Question 9

Which statement about the electric field inside a good conductor in electrostatic equilibrium is correct?

Accepted Answer

The electric field is zero.

Question 10

What is the direction of the electric field just outside the surface of a charged conductor in electrostatic equilibrium?

Accepted Answer

Perpendicular to the surface

Question 11

Which equation correctly expresses Coulomb's Law for the force between two point charges $$q_1$$ and $$q_2$$ separated by distance $$r$$?

Accepted Answer

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

Question 12

A small positive test charge $$q is $$placed at a point where the electric field is $$E. $$What is the force experienced by the test charge?

Accepted Answer

$$F = qE$$

Question 13

Which of the following is true about electric field lines?

Accepted Answer

They point away from positive charges and toward negative charges.

Question 14

A metal sphere is placed in a uniform external electric field. What happens to the electric field inside the sphere?

Accepted Answer

It is zero.

Question 15

Which of the following best describes Gauss's Law?

Accepted Answer

The total electric flux through a closed surface is equal to the net charge enclosed divided by the permittivity of free space.

Question 16

A point charge $$Q is $$placed at the center of a spherical surface of radius $$r. $$What is the electric flux through the surface?

Accepted Answer

$$\Phi = Q/\$$epsilon_0$$

Question 17

Which of the following is NOT a consequence of the quantization of electric charge?

Accepted Answer

It is possible to have a charge of $$2.5e.$$

Question 18

A piece of paper is attracted to a charged rubber balloon. What is the most likely explanation?

Accepted Answer

The balloon induces a polarization in the paper, causing attraction.

Question 19

Which of the following is the correct unit for electric field strength?

Accepted Answer

Newtons per Coulomb (N/C)

Physics 1409: Electricity, Magnetism, and Electric Fields – Study Notes

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