Question

List some difference between solenoid and bar magnet

Answer 1

As in the case of bar-magnets, the magnetic field is stronger inside the solenoid than outside it. Magnetic field lines are closely packed inside the solenoid, and magnetic field is concentrated into a nearly uniform magnetic field inside the solenoid. The magnetic fields outside are weak and spread out.

a bar magnet is a permanent magnet where as solenoid is a electromagnet.i.e.it acts as a magnet only when electricity is passed through it.

Solenoid is comprised of a conducting rod with turns of a wire all over its length and when electricity is passed through that wire the core or that rod gets magnetised making this setup a strong magnet and as its due to electricity, its rightly called an electromagnet. It behaves like a magnet only till electricity is kept flowing otherwise it loses its magnetism hence it is also called a temporary magnet also. Bar magnet is a natural magnet and it behaves as such without any external influence. Its magnetic field or the area in which its magnetism can be observed is quite small compared to a solenoid which is a stronger magnet.

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Answer 2

solenoid is like a shape of spring. it's magnetic field remains the same