An electromagnetic waves can be produced, when charge is
Moving with constant velocity
Moving in a circular orbit
Falling in an electric field
both (b) and (c)
The correct option is D both (b) and (c) An accelerated charge is the source of electromagnetic waves (EMWs). When the charge is in a circular motion, the direction of its velocity continuously changes and thus it is in accelerated motion and produces EMWs.
A charge falling in an electric field is accelerated by the electric force and thus produces EMWs.