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Solution


Q.

The source of time varying magnetic field may be                     [2023]

(A) a permanent magnet
(B) an electric field changing linearly with time
(C) direct current
(D) a decelerating charge particle
(E) an antenna fed with a digital signal

Choose the correct answer from the options given below:
1 (D) only  
2 (C) and (E) only  
3 (A) only  
4 (B) and (D) only  

Ans.

(1)

Source of time varying magnetic field may be

→ accelerated or retarded charge which produces varying electric and magnetic fields.

→ An electric field varying linearly with time will not produce variable magnetic field as current will be constant