Q-12. The source of electromagnetic waves can be a charge
(a) moving with a constant velocity.
(b) moving in a circular orbit.
(c) at rest.
(d) falling in an electric field.
Ans:(b) and (d)
Explanation:
Electromagnetic wave can be produced by accelerated (or) oscillation charge.
An oscillating charge is accelerated continuously, it will radiate electromagnetic wave continuously .
Electromagnetic waves are also produced when fast moving electrons are suddenly stopped by metal target of high atomic number (x-rays)
Motion of particle in circular orbit is accelerated motion.
When charged particle falls in electric field, its velocity is changes and its motion becomes accelerated and can produce electromagnetic wave.
