1. Coulomb is the unit of which quantity?

• (a) Field strength

• b) Charge

• c) Permittivity

• d) Force

2. Coulomb law is employed in

• a) Electrostatics

• b) Magnetostatics

• c) Electromagnetics

• d) Maxwell theory

3. Find the force between 2C and -1C separated by a distance 1m in air(in newton).x

• a) 18 X 106

• b) -18 X 106

• c) 18 X 10-6

• d) -18 X 10-6

4. Two charges 1C and -4C exists in air. What is the direction of force?

• a) Away from 1C

• b) Away from -4C

• c) From 1C to -4C

• d) From -4C to 1C

. A charge of 2 X 10-7 C is acted upon by a force of 0.1N. Determine the distance to the other charge of 4.5 X 10-7 C, both the charges are in vacuum. x b) 0.05 x

• a). 0,03

• b)0.05

• c) 0.07

• d) 0.09

. For a charge Q1, the effect of charge Q2 on Q1 will bea) b) x

• a)F1=F2

• b)F1 = -F2

• c)F1=F2=0

• d) F1 and F2 are not equal