Electromagnetic waves are produced when
a) an electric charge vibrates or accelerates
b) there is exertion of magnetic forces on charged particles
c) there is alignment of an electric field and a magnetic field
d) a magnetic change occurs in a medium

The correct answer is a.

Explanation:

Electromagnetic wave is a wave in which the magnetic field and the electric field are perpendicular to each other.

Both fields are directed in the direction of the propagation of the electromagnetic wave. It travels with the speed of the light.

The motion of the electric field produces both electric field and the magnetic field.

The electromagnetic waves are produced when an electric charge vibrates or accelerates.

Therefore, the correct option is (a).

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