Question 1

Which of the following statements best describes the process of charging by induction?

Accepted Answer

It involves redistributing charges in an object due to the presence of a nearby charged object, without direct contact.

Question 2

A glass rod is rubbed with silk and becomes positively charged. What happens at the atomic level?

Accepted Answer

Electrons are transferred from the glass rod to the silk.

Question 3

Which of the following is the correct SI unit for electric charge?

Accepted Answer

Coulomb (C)

Question 4

According to Coulomb's Law, what is the force between two point charges $$q_1$$ and $$q_2$$ separated by a distance $$r$$?

Accepted Answer

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

Question 5

Which property is true for conductors in electrostatic equilibrium?

Accepted Answer

Any excess charge resides entirely on the surface.

Question 6

A proton and an electron are placed 1 nm apart in vacuum. Which force is stronger: the electric force between them or the gravitational force?

Accepted Answer

The electric force is stronger by many orders of magnitude.

Question 7

Which of the following best describes the direction of the electric field produced by a negative point charge?

Accepted Answer

It points radially inward toward the charge.

Question 8

If three point charges are placed at the vertices of a right triangle, how do you determine the net force on one of the charges?

Accepted Answer

Add the forces as vectors using the superposition principle.

Question 9

Which experiment demonstrated that electric charge is quantized?

Accepted Answer

Millikan Oil-Drop Experiment

Question 10

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

Accepted Answer

The charges in the insulator polarize, with positive charges aligning closer to the rod.

Question 11

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

Accepted Answer

Two field lines can cross each other.

Question 12

What is the electric field at a distance $$r$$ from a point charge $$Q$$?

Accepted Answer

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

Question 13

Which material is most likely to allow electric charges to move freely?

Accepted Answer

Copper

Question 14

A charged comb attracts small pieces of paper. What is the best explanation for this phenomenon?

Accepted Answer

The comb polarizes the molecules in the paper, causing attraction.

Question 15

Which of the following statements about the electric field inside a conductor in electrostatic equilibrium is correct?

Accepted Answer

The electric field is zero everywhere inside the conductor.

Question 16

If a conductor has an irregular shape, where does the excess charge tend to accumulate?

Accepted Answer

At locations where the radius of curvature is smallest (sharp points).

Question 17

Which of the following best describes the difference between conductors and insulators?

Accepted Answer

Conductors allow electrons to move freely, while insulators do not.

Question 18

A point charge $$q is $$placed at the origin. What is the direction of the electric field at a point on the positive $$x-$$axis?

Accepted Answer

Away from the origin if $$q is $$positive.

Question 19

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

Accepted Answer

The net force on a charge is the vector sum of the individual forces from all other charges.

Question 20

Which of the following is the correct expression for the electric dipole moment $$\vec{p}$$ for two charges $$+q$$ and $$-q$$ separated by distance $$d$$?

Accepted Answer

$$\vec{p} = qd$$

Electric Charge and Electric Field: Fundamental Concepts and Laws

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