Coulomb’s Law | MCQs Quiz Electric Charges & Fields Share with your friendsElectric Charges & Fields Topic Based Quiz (Coulomb’s Law) General Instructions This quiz is based on Coulomb’s Law. Each question carries one mark. There is no negative marking. Keep a rough notebook with you for rough work. All the best! 1. The force between two charged particles separated by a distance r varies as- A. r^{2} B. r C. 1/r D. 1/r^{2} Option (A) Option (B) Option (C) Option (D) 2. The unit of ε_{0} is- A. CN^{-1}m B. C^{2}N^{-1}m^{-2} C. Nm^{2}C^{-1} D. C^{-2}Nm^{2} Option (A) Option (B) Option (C) Option (D) 3. Two charges q_{1} and q_{2} are r distance apart. The ratio of electrostatic forces acting on them will be- A. q_{1} : q_{2} B. q_{2} : q_{1} C. q_{1}^{2} : q_{2}^{2} D. 1 : 1 Option (A) Option (B) Option (C) Option (D) 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- (m_{p} = 1836 m_{e}) F 2F 1836 F F / 1836 5. If two charges of 1 coulomb each are placed 1 km apart, then the force between them will be- A. 9 x 10^{3} 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) 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) 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 8. When two particles having charges q_{1} and q_{2} 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 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 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 1 out of 10 Time's up Share with your friends