Choose the correct answer of the following: 1. The value of fundamental charge in: (a) 1.6 x 10^-19 (b) 4 x 10^-10 (c) 1.6 x 10^-10 (d) 14 x 10^-10 C. 2. The number of electrons in... Choose the correct answer of the following: 1. The value of fundamental charge in: (a) 1.6 x 10^-19 (b) 4 x 10^-10 (c) 1.6 x 10^-10 (d) 14 x 10^-10 C. 2. The number of electrons in one coulomb charge is: (a) 546 x 10^19 (b) 625 x 10^19 (c) 1.6 x 10^10 (d) 90 x 10^19. 3. The maximum charge on a proton is: (a) 1 x 10^-19 (b) 1 x 10^-10 (c) 4 x 10^-10 (d) 6 x 10^-10 C. 4. The intensity of electric field E due to charge Q at distance r is: (a) E = kQ/r^2 (b) E = kQ/r (c) E = kQ/r^3 (d) E = kQ/r^4. 5. The value of permittivity of vacuum (or free space) is: (a) 885 x 10^-12 (b) 9 x 10^-10 (c) 9 x 10^9 Nm^2/C^2 (d) 8.85 x 10^-12. 6. The work done in rotating a dipole of dipole moment p through an angle 180° from direction of uniform electric field E is: (a) 2pE (b) pE (c) 0 (d) Zero. 7. The intensity of electric field E due to a dipole of dipole moment p at a point r distance from the center of dipole depends on: (a) E ∝ 1/r^2 (b) E ∝ 1/r (c) E ∝ 1/r^3 (d) E ∝ r. 8. The intensity of electric field inside a charged hollow sphere is: (a) Infinite (b) Zero (c) One (d) None of these. 9. The total electric flux emerges out from unit positive charge in air is: (a) 1/ε0 (b) 1/ε0 (c) 4πε0 (d) None of these. 10. The dielectric constant of metal is: (a) Infinite (b) Zero (c) One (d) None of these. 11. The S.I. unit of electric dipole moment is: (a) coulomb x metre (b) coulomb x metre^2 (c) coulombie/metre (d) coulomb/metre. 12. The force acting on a charge 'q' in an electric field of intensity E is: (a) F = E/q (b) F = qE (c) F = q^2E (d) P = E - q. 13. S.I. unit of intensity of electric field is: (a) C/N (b) N/C (c) 1/C (d) C/J. Read more