How are electromagnetic waves produced?
a) an accelerating electric point charge (electron) emits electromagnetic waves.
b) a bar magnet moving in a strong electric field produces electromagnetic waves.
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c) a large electromagnet operated at very high voltages produces electromagnetic waves.
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d) a stable nucleus moving through a stable magnetic field produces electromagnetic waves.

The correct answer is option A, An accelerating electric point charge (electron) emits electromagnetic waves

Explanation:

An accelerating electric charged particle produces electromagnetic waves. The accelerating charged particle produces magnetic and electric field whose magnitude is changing continuously. Thus a changing electric field produces magnetic field and a changing magnetic field produces electric field. This changing electric and magnetic field produces electromagnetic wave which are able to move through a vacuum space and thus need no medium to travel

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