Question

How electromagnet made?name tow factors on wch the strenth of megnetic field of the electromagnet depends.

Answer 1

An electromagnet is made out of a coil of wire wrapped around a metal core(usually iron) and connected to a battery. 

STRENGTH OF MAGNETIC FIELD DEPEND UPON
1) Number of loops in the coil more the number of loops more the strength is
2)AMOUNT of current passing through it also determine the strength of it more the current more is the strength .
3) Metal core
4) Gauge of wire thicker the wire weaker the magnetic field .