Electric Field

Question 1

State Coulomb’s Law and the formula derived from it.

Answer 1

Coulomb’s Law states that the electric force between two point charges is proportional to product of their charges and inversely proportional to square of
separation/distance between them.

F = Q1Q2/4πε0r^2
Q = charge, r = distance between charges

Question 2

Define an electric field.

Answer 2

An electric field is a region where a charged body experiences an electric force.

Question 3

Define electric field strength and its formula.

Answer 3

It is defined as the electric force per unit charge acting on a positive test charge placed at a point in a region of electric field.

E = Q/4πε0r^2

Question 4

Define electric potential.

Answer 4

Electric potential at a point in an electric field is defined as the work done per unit positive charge by an external agent in bringing a small test charge from infinity to the point without any change in kinetic energy.

Question 5

Define electric potential energy.

Answer 5

Electric potential energy at a point in an electric field is defined as the work done by an external agent in bringing a small test charge from infinity to the point without any change in kinetic energy.