Question

Explain How make an electromagnet to be able pick up a metal object at a flip of a switch

Answer 1

I expect that you have the knowledge of the magnetic, as a charged particle moves with the certain velocity (which we generally called as current), which produces the magnetic field around the current.

Now let's consider a circular loop in which the current is flowing, then it will produce a magnetic field as a bar magnet produces.

A similar kind of the loop is present in the case of the solenoid which consists a number of the circular loop in which a current is flowing which then produces a magnetic field. A solenoid is connected in circuit to give the current as we switch on, which on turning the switch the magnetic field is produced and the magnetic substance(iron etc.) get attracted towards it due to the magnetic force produced by the magnetic field.