Q: What is the value of the elementary charge $$e$$?

$$e = 1.602 \times 10$$^{-19}$$ C

Question 1

Which of the following statements best describes the behavior of electric charges according to Coulomb’s Law?

Accepted Answer

Like charges repel each other, and opposite charges attract each other.

Question 2

A glass rod is rubbed with silk, resulting in the rod becoming positively charged. What happens to the silk?

Accepted Answer

The silk becomes negatively charged with equal magnitude.

Question 3

Which material allows electrons to move freely, making it a good conductor?

Accepted Answer

Copper

Question 4

What is the formula for the magnitude of the electrostatic force between two point charges $$q_1$$ and $$q_2$$ separated by distance $$r$$?

Accepted Answer

$$F = \frac{1}{4\pi\$$varepsilon_0$$} \frac{|q_1$||q_2$|}{r^2$}$$

Question 5

If two identical spherical conductors touch, what happens to any excess charge?

Accepted Answer

The excess charge is shared equally between the two spheres.

Question 6

Which of the following is NOT a property of electric charge?

Accepted Answer

Charge can be created from nothing.

Question 7

A neutral copper rod is brought near a negatively charged plastic rod. What happens to the charges in the copper rod?

Accepted Answer

Conduction electrons in the copper rod are repelled to the far end, leaving positive charge near the plastic rod.

Question 8

Which equation correctly expresses the quantization of electric charge?

Accepted Answer

$$q = n e$$

Question 9

What is the value of the elementary charge $$e$$?

Accepted Answer

$$e = 1.602 	imes 10$$^{-19}$$ C

Question 10

If two protons in an iron nucleus are separated by $$4.0 	imes 10$$^{-15}$$ m, what is the magnitude of the repulsive force between them?

Accepted Answer

$$F = 14 N$$

Question 11

Which of the following best describes the distribution of excess charge on a spherical conductor?

Accepted Answer

Excess charge spreads out uniformly over the external surface area.

Question 12

A shell of uniform charge attracts or repels a charged particle outside the shell as if:

Accepted Answer

All the shell’s charge were concentrated at the shell’s center.

Question 13

If a charged particle is located inside a shell of uniform charge, what is the net electrostatic force on the particle from the shell?

Accepted Answer

The net force is zero.

Question 14

Which of the following is true about the net electric charge of an isolated system?

Accepted Answer

It is always conserved.

Question 15

Which particle in an atom is responsible for conduction in metals?

Accepted Answer

Conduction electrons

Question 16

A non-conducting object can have which type of charge distribution?

Accepted Answer

Any given distribution, including charge at interior points

Question 17

Which of the following best describes the relationship between current $$I$$, charge $$Q$$, and time interval $$\Delta t$$?

Accepted Answer

$$I = \frac{Q}{\Delta t}$$

Question 18

Two charged particles, $$q_1 = 1.60$$ 	imes $$10^{-19} C $$and $$q_2 = 3.2$$ 	imes $$10^{-19} C$$, are separated by $$R = 0.0200 m. $$What is the magnitude of the electrostatic force between them?

Accepted Answer

$$1.15 	imes 10$$^{-24}$$ N

Question 19

If more than one force acts on a particle, how is the net force determined?

Accepted Answer

By adding all the forces as vectors.

Question 20

A charged rod is brought near a neutral object. What happens to the charges in the neutral object?

Accepted Answer

Charges in the neutral object rearrange, causing induced charge.

Coulomb’s Law and Electric Charge: Foundations of Electrostatics

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