Electromagnetics – Multiple Choice Questions (MCQs)

1. 13. The divergence of the magnetic field B is always:

   • A. Zero
   • B. Non-zero
   • C. Positive
   • D. Negative

2. 14. Electrostatic potential inside a charged spherical shell is:

   • A. Zero
   • B. Non-zero and constant
   • C. Varies linearly with distance
   • D. Varies inversely with distance

3. 15. Which of the following is a unit of electric potential?

   • A. Volt
   • B. Coulomb
   • C. Farad
   • D. Joule

4. 16. The force on a charge q moving with velocity v in a magnetic field B is given by:

   • A. F = q(v x B)
   • B. F = q(E + v x B)
   • C. F = qE
   • D. F = qvB

5. 17. What happens to the electric field inside a conductor in electrostatic equilibrium?

   • A. It is maximum
   • B. It is zero
   • C. It is constant and non-zero
   • D. It varies linearly

6. 18. Which equation describes the relationship between the electric field and magnetic field in a time-varying electromagnetic field?

   • A. Ampere's Law
   • B. Faraday's Law
   • C. Gauss's Law
   • D. Biot-Savart Law

7. 19. The boundary condition for the tangential component of the electric field at the interface between two dielectric media is that it is:

   • A. Discontinuous
   • B. Continuous
   • C. Zero
   • D. Infinite

8. 20. The Poynting vector S is defined as:

   • A. E x H
   • B. E . H
   • C. E/H
   • D. H/E

9. 21. Transmission lines are used to transfer energy from:

   • A. High frequency to low frequency
   • B. Low frequency to high frequency
   • C. Source to load
   • D. Load to source

10. 22. The characteristic impedance of a lossless transmission line is given by:

    • A. √(L/C)
    • B. √(C/L)
    • C. L/C
    • D. C/L

11. 23. A perfectly matched transmission line has a voltage standing wave ratio (VSWR) of:

    • A. 0
    • B. 1
    • C. Infinity
    • D. 0.5

12. 24. The reflection coefficient for a short circuit is:

    • A. 1
    • B. -1
    • C. 0
    • D. Infinity