Electrostatics

Question 1

What is the unit of electric charge?

Answer 1

Coulomb (C)

Question 2

True or False: Like charges repel each other.

Answer 2

True

Question 3

Fill in the blank: The force between two point charges is described by _______ law.

Answer 3

Coulomb’s

Question 4

What does the electric field (E) represent?

Answer 4

The force per unit charge experienced by a positive test charge.

Question 5

What is the formula for calculating electric field due to a point charge?

Answer 5

E = k * |Q| / r^2

Question 6

What does ‘k’ represent in the electric field formula?

Answer 6

Coulomb’s constant, approximately 8.99 x 10^9 N m²/C²

Question 7

True or False: The electric field inside a conductor in electrostatic equilibrium is zero.

Answer 7

True

Question 8

What is the principle of superposition in electrostatics?

Answer 8

The net electric field due to multiple charges is the vector sum of the electric fields due to individual charges.

Question 9

What is an equipotential surface?

Answer 9

A surface on which the electric potential is constant.

Question 10

Fill in the blank: The electric potential (V) is defined as the _______ per unit charge.

Answer 10

work done

Question 11

What is the relationship between electric field (E) and electric potential (V)?

Answer 11

E = -dV/dr

Question 12

What is the formula for electric potential due to a point charge?

Answer 12

V = k * Q / r

Question 13

True or False: Electric field lines can cross each other.

Answer 13

False

Question 14

What is the Gaussian surface used for in electrostatics?

Answer 14

To apply Gauss’s law to calculate electric fields.

Question 15

Fill in the blank: Gauss’s law states that the electric flux through a closed surface is proportional to the _______ enclosed within that surface.

Answer 15

charge

Question 16

What is the formula for electric flux (Φ)?

Answer 16

Φ = E * A * cos(θ)

Question 17

What is the significance of a uniform electric field?

Answer 17

The electric field strength is constant in magnitude and direction.

Question 18

What is electric dipole moment?

Answer 18

The product of the charge and the distance between the charges in a dipole.

Question 19

What is the formula for electric dipole moment (p)?

Answer 19

p = q * d

Question 20

True or False: The potential energy of an electric dipole in an electric field is given by U = -p · E.

Answer 20

True

Question 21

What is the condition for electrostatic equilibrium?

Answer 21

The net force and net torque on the system must be zero.

Question 22

Fill in the blank: The work done in moving a charge in an electric field is equal to the change in _______.

Answer 22

potential energy

Question 23

What happens to the electric field inside a charged hollow conductor?

Answer 23

It is zero.

Question 24

What is the formula for the potential energy (U) of a system of point charges?

Answer 24

U = k * Σ(qi * qj / rij)

Question 25

True or False: The electric field due to an infinite plane sheet of charge is constant.

Answer 25

True

Question 26

What is the effect of grounding a conductor?

Answer 26

It allows charges to flow to or from the ground, neutralizing the conductor.

Question 27

What does the term 'polarization' refer to in electrostatics?

Answer 27

The separation of charges within an object, causing a charge distribution.