Question

if a solenoid is made up of insulated metals...how will we let pass the current??

Answer 1

[Tex] answer [/Tex]

because insulation is outside and the conductor is present inside...

Answer 2

By insulated metals, we mean metallic wires made of good conductors that are only covered in insulating material like PVC or plastic coating so prevent accidents/shocks on touching it.

So the current passes through it without any problem.