Question

An electromagnetic waves can be produced, when charge is
A. Moving with constant velocity.
B. Moving in circular orbit.
C. Falling in the electric field.
D. Both B and C.

Answer 1

The basic concept which will be used in this question is when a charge is in the accelerated state it produces an electromagnetic field. An oscillating charge is accelerating continuously, it will radiate electromagnetic waves continuously.

Complete answer:
In option, B charge is moving in circular orbit which means that the charge is changing its direction during its motion which means the charge is in accelerated state.
Hence option B moving in circular orbit is correct further in option C. We can see that charge is falling in an electric field and we know that when charge falls in the electric field it experiences a force and hence motion can be defined as accelerated motion. So further we can say that option C is also held true.

So, the correct answer is “Option D”.

Additional Information:
Vibrations between an electric field and magnetic field results in or production of electromagnetic waves. In other words, EM waves are made up of oscillating electric and magnetic fields.
Electromagnetic waves do not require any medium for their movement which means they can travel through solid liquid gas and also through the vacuum of space. Some examples of electromagnetic waves are radio waves, microwaves, infrared, (visible) light, ultraviolet, X-rays, and gamma rays. This also proved that radio waves are part of the light.

Note:
An electron circulates in an atom around the nucleus in a stable orbit, although we can say that only accelerating does not emit an electromagnetic wave. Waves are only emitted when an electron jumps from a higher energy orbit to a lower energy orbit. A simple LC oscillator is used to produce the waves of a different or desired frequency.