Explain the reason for the following in a power generator
Strong electromagnets are used as field magnet.

Explain the reason for the following in a power generator Three armature coils are arranged at 120^@ angular separation.

Which of the following has a magnetic field like that of a bar magnet ?

Define tesla. using the expression for the force on a charged particle moving in a magnetic field.

Can a powerful magnetic or electric field deflect gamma rays ?