A) a stationary charge
B) uniformly moving charges
C) accelerated charges
D) all of the above
Correct Answer: C
Solution :
A stationary charge produces electric field only; a uniformly moving charge produces localized electromagnetic field. An accelerated charge produces electromagnetic radiations. The reason is that due to accelerated charges, magnetic field is produced around accelerating charges. As the velocity of charge changes, the magnetic field produced due to it also changes with time. This varying magnetic field produces the electric field. The electric field so produced also changes with time. These two varying fields are mutually perpendicular and also perpendicular to the direction of propagation of wave and both the fields are in same phase and of same frequency. The frequency of these fields is same as the frequency of oscillations of the charged particle. The wave associated with these oscillations is called the electromagnetic wave.
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