What is electromagnetic spectrum? To what uses it is put to?

What is the electromagnetic spectrum?

What is an electromagnet?

What is electromagnetic force?

What is electromagnetic spectrum? Give its four uses.

An electromagnet uses

What are electromagnetic waves?

Electromagnetic radiations with wavelength: gamma_3 play an important role in maintaining the earth's warmth. Name the part of electromagnetic spectrum to which these radiations belong.

What is electromagnetic induction ? State its laws.