Question

Analyse and compare the ability of solenoid and bar magnet to bring changes in permanency of the magnetism, polarity and the strength of the magnetism.

Bar magnet	Solenoid
The magnetism is permanent	The magnetism is temporary
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Answer 1

Bar magnet	Solenoid
The magnetism is permanent	The magnetism is temporary
1. The magnetism is permanent	1. The magnetism is temporary
2. Permanent magnet	2. Electromagnet It act as a magnet when current passed through it.
3. Weak magnetic field	3. Strong magnetic field
4. Strength cannot be changed.	4. Strength can be changed by changing the current through it or changed the number of turns.
5. Polarity is fixed and cannot be easily reversed.	5. The polarity can be reversed by changing the direction of current through it