Question 1

Which of the following particles are negatively charged?

Accepted Answer

electrons

Question 2

Which of the following particles are found in the atomic nucleus?

Accepted Answer

neutrons & protons

Question 3

What type of particle 'flows' in solid wires to create electric current?

Accepted Answer

electrons

Question 4

When John rubs his foot on the carpet and then touches a metal doorknob, he receives a shock. What is the best explanation for this phenomenon?

Accepted Answer

Electrons move from the carpet to John, and then to the doorknob, discharging static electricity.

Question 5

If a balloon is rubbed against a sweater and then sticks to a wall, what is the most likely explanation?

Accepted Answer

The balloon becomes negatively charged and the wall is neutral or slightly positive, causing attraction.

Question 6

Which statement about conductors and insulators is correct?

Accepted Answer

Electrons are free to move in conductors but not in insulators.

Question 7

What is the charge on a rod that has $$6.25 	imes 10$$^{18}$$ excess protons?

Accepted Answer

$$1$$ Coulomb

Question 8

Which equation best represents charge quantization for a macroscopic object?

Accepted Answer

$$q = N_p e + N_e (-e)$$

Question 9

Two point charges $$Q_1 = 2$$\,C$$ and Q_2$ = -5\,C$$ attract each other with a force of $$2\,N at a $$fixed distance. If the charge on $$Q_1 is $$reduced to $$1\,C$$, what will be the new force?

Accepted Answer

$$1.0\,N$$

Question 10

According to Coulomb's Law, what happens to the force between two point charges if the distance between them is doubled?

Accepted Answer

The force is quartered.

Question 11

Which formula gives the magnitude of the electrostatic force between two point charges?

Accepted Answer

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

Question 12

A charged particle experiences a force in an electric field. Which equation relates the force to the field and the charge?

Accepted Answer

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

Question 13

The electric field created by a point charge $$Q at a $$distance $$r is $$given by:

Accepted Answer

$$|E| = \frac{kQ}{r^2$}$$

Question 14

Which statement about electric field lines is correct?

Accepted Answer

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

Question 15

In a parallel-plate capacitor, which plate is positive if the electric field points from left to right?

Accepted Answer

Right

Question 16

What is the direction of the electric field at a point near a negative charge?

Accepted Answer

Towards the charge

Question 17

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

Accepted Answer

The electric field is zero everywhere inside the conductor.

Question 18

A uniform electric field has which property?

Accepted Answer

The same magnitude and direction at all points in space.

Question 19

If two identical spheres, one charged and one neutral, are connected by a conductor, what happens?

Accepted Answer

Electrons move until the excess charge is evenly distributed.

Electric Fields: Charge, Force, and Field Concepts

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