Q. Assertion An oscillating charge produces an electric field in space, which produces an oscillating magnetic field, which in turn, is a source of electric field and so on.
Reason The oscillating electric and magnetic field thus regenerate each other, so to speak, as the wave propagates through the space.

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Solution:

An oscillating charge produces an electric field in space, which produces an oscillating magnetic field, which in turn, is a source of electric field.