What do you mean by electromagnet induction?under what condition is this phenomenon possible?

Electromagnetic induction is a phenomenon in which a changing magnetic field across a loop of wire results in the generation of an induced emf. When there is relative motion between a magnet and the coil, magnetic flux changes and hence an electromotive force is generated in the coil.

it is easily magnetized.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6