Question

Is solenoid made only with insulated copper wire?

Answer 1

No, it is also made up of a hollow iron core

Answer 2

$\underline\bold{Solenoid:-}$

Solenoid is made by looping a metal wire around a rod . The metal wire used should we made from the metal which is a good conductor which can be copper , silver , aluminium,etc. It generates the magnetic field when current is passed through it.

A solenoid is a helix whose diameter is comparatively very small than its length.

When the current is passed through it a nearly uniform magnetic field is set up in the interior and along the axis of solenoid.

B = u. n I

if you want to increase the magnetic field then can we have to

(i) increases the intensity of current flowing through it

(ii). increase the number of turns per unit length.