What are the uses of electromagnets?

Mention the uses of electromagnets.

Distinguish between wireline and wireless communication? Specify the range of electromagnetic waves in which it is used.

Discuss the source of electromagnetic waves

Name some equipments that use electromagnetism for functioning.

Which part of the Electromagnetic spetrum spectrum is used in operating a RADAR and why?

The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula E= h upsilon (for energy of a quantum of radiation : photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation ?

Use the formula lambda_(m)T=0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you ?