Coulomb’s Law | MCQs Quiz

The force between two charged particles separated by a distance r varies as-

A. r²

B. r

C. 1/r

D. 1/r²

The unit of ε₀ is-

A. CN^-1m

B. C²N^-1m^-2

C. Nm²C^-1

D. C^-2Nm²

Two charges q₁ and q₂ are r distance apart. The ratio of electrostatic forces acting on them will be-

A. q₁ : q₂

B. q₂ : q₁

C. q₁² : q₂²

D. 1 : 1

The force of repulsion between two electrons at a certain distance is F. The force between two protons separated by the same distance is- (m_p = 1836 m_e)

If two charges of 1 coulomb each are placed 1 km apart, then the force between them will be-

A. 9 x 10³ N

B. 9 x 10^-3 N

C. 9 x 10^-4 N

D. 10^-6 N

A proton and an electron are placed 1.6 cm apart in free space. The magnitude and nature of electrostatic force between them is-

A. 9 x 10^-25 N ; attractive

B. 9 x 10^-25 N ; repulsive

C. 9 x 10^-29 N ; attractive

D. 9 x 10^-29 N ; repulsive

When two particles having charges q₁ and q₂ are kept at a certain distance, they exert a force F on each other. If the distance between the two particles is reduced to half and the charge on each particle is doubled, then the force between the particles would be-

Two point charges of +3 μC and +4 μC repel each other with a force of 10 N. If each is given an additional charge of -6 μC, the new force between them is-