Describe a solenoid. Draw the pattern of magnetic field lines of
(i) a current-carrying solenoid and
(ii) a bar magnet. Mention two differences between the characteristics of the two fields.

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Detailed Solution

A solenoid is a coil with many circular terns where the wire is tightly wrapped in the shape of a cylinder. It is used as an electromagnet.

The pattern of magnetic field lines of a current-carrying solenoid:

The pattern of magnetic field lines of bar magnet:

Two distinguishing features between the two fields are given below:

Features	Solenoid	Bar Magnet
(a) Pole	The poles of a solenoid are considered to be at the edge.	Inside the bar, the magnet is the pole of the bar magnet.
(b) Magnetism	Magnetism exists in a solenoid until an electric current flow through it.	Magnetism is always present in a bar magnet.

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