Under what conditions do electromagnetic waves arise?

The condition for the emergence of electromagnetic waves is the accelerated movement of electric charges. So, a change in the magnetic field occurs when the current in the conductor changes, and the current changes when the speed of the charges changes, that is, when they move with acceleration.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.