physics electrostatics

Question 1

What is the formula for Coulomb’s Law?

Answer 1

F = k * (|q1 * q2|) / r^2

Question 2

In Coulomb’s Law, what does ‘k’ represent?

Answer 2

‘k’ is the electrostatic constant, approximately 8.99 x 10^9 N m^2/C^2.

Question 3

True or False: The force between two charges is directly proportional to the distance between them.

Answer 3

False

Question 4

Fill in the blank: The electric field ‘E’ due to a point charge ‘Q’ at a distance ‘r’ is given by ______.

Answer 4

E = k * |Q| / r^2

Question 5

What is the SI unit of electric charge?

Answer 5

Coulomb (C)

Question 6

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

Answer 6

False

Question 7

What is the formula for electric potential ‘V’ due to a point charge ‘Q’ at a distance ‘r’?

Answer 7

V = k * Q / r

Question 8

Multiple choice: What is the unit of electric field?

Answer 8

N/C

Question 9

What does the term ‘equipotential surface’ mean?

Answer 9

A surface where the electric potential is constant.

Question 10

What is the relationship between electric field and electric potential?

Answer 10

E = -dV/dx

Question 11

Fill in the blank: The work done ‘W’ in moving a charge ‘q’ through a potential difference ‘V’ is given by ______.

Answer 11

W = qV

Question 12

What is the formula for the capacitance ‘C’ of a parallel plate capacitor?

Answer 12

C = ε0 * A / d

Question 13

In the capacitance formula, what does ‘A’ represent?

Answer 13

‘A’ is the area of one of the plates of the capacitor.

Question 14

True or False: Capacitance depends on the charge stored and the voltage across the capacitor.

Answer 14

True

Question 15

What is the formula for calculating the energy ‘U’ stored in a capacitor?

Answer 15

U = 1/2 C V^2

Question 16

Multiple choice: Which of the following materials is commonly used as a dielectric?

Answer 16

Glass

Question 17

What is the effect of a dielectric on the capacitance of a capacitor?

Answer 17

It increases the capacitance.

Question 18

Fill in the blank: The relationship between charge ‘Q’, capacitance ‘C’, and voltage ‘V’ is given by ______.

Answer 18

Q = C * V

Question 19

What is the formula for the electric field inside a charged conductor?

Answer 19

E = 0

Question 20

True or False: Electric field lines point away from positive charges and towards negative charges.

Answer 20

True

Question 21

What is Gauss’s Law?

Answer 21

The electric flux through a closed surface is proportional to the enclosed charge.

Question 22

What is the formula associated with Gauss’s Law?

Answer 22

Φ_E = Q_enc / ε0

Question 23

Multiple choice: What does ‘Φ_E’ represent in Gauss’s Law?

Answer 23

Electric flux

Question 24

What is the relationship between electric field ‘E’ and surface charge density ‘σ’ according to Gauss’s Law?

Answer 24

E = σ / ε0

Question 25

Fill in the blank: The electric potential difference between two points is equal to the ______ of the electric field along the path between them.

Answer 25

negative integral