NEET Questions Solved

NEET - 2016

 

Out of the following options which one can be used to produce a propagating electromagnetic wave?

(a) A stationary charge               (b) A chargeless particle

(c) An accelerating charge          (d) A charge moving at constant velocity

 

(c) An electric charge at rest has electric field in the region around it, but no magnetic field. A moving charge produces both the electric and magnetic fields. If a charge is moving with a constant velocity, the electric and magnetic fields will not change with time, hence no EM wave will be produced. But if the charge is moving with a non-zero acceleration, both the electric and magnetic field will change will space and time, it then produced EM wave. This shows that accelerated charge emits electromagnetic waves.

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