Electric Charges & Fields | Coulomb's Law All the best! 1. The force between two charged particles separated by a distance r varies as- A. r2 B. r C. 1/r D. 1/r2 Option (A) Option (B) Option (C) Option (D) None 2. The unit of ε0 is- A. CN-1m B. C2N-1m-2 C. Nm2C-1 D. C-2Nm2 Option (A) Option (B) Option (C) Option (D) None 3. 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 Option (A) Option (B) Option (C) Option (D) None 4. The force of repulsion between two electrons at a certain distance is F. The force between two protons separated by the same distance is- (mp = 1836 me) F 2F 1836 F F / 1836 None 5. 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 Option (A) Option (B) Option (C) Option (D) None 6. 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 Option (A) Option (B) Option (C) Option (D) None 7. If the distance between two charges become double, then electrostatic force between them will become- 2 times 4 times 1/4 times 1/2 times None 8. 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- 2F 4F 8F 16F None 9. Two point charges separated by a distance d repel each other with a force of 9 N. If the separation between them becomes 3d, the force of repulsion will be- 1 N 3 N 6 N 27 N None 10. 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- 5 N 5.5 N 6 N 6.5 N None 1 out of 10 Time's up
