Question

Definition of solenoid

Answer 1

1.a coil of wire, usually cylindrical, in which a magnetic field is set up by passing a current through it

2. 

a coil of wire, partially surrounding an iron core, that is made to move inside the coil by the magnetic field set up by a current: used to convertelectrical to mechanical energy, as in the operation of a switch

3. 

such a device used as a relay, as in a motor vehicle for connecting the battery directly to the startermotor when activated by the ignition switch

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Answer 2

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. 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.

The Magnetic field are uniform inside the looping area of the solenoid. The field lines don't intersect each other.

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.