difference between a permanent magnet and a solenoid
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1.A solenoid is a temporary magnet as it can readily be demagnetized by stopping the current through the solenoid whereas a bar magnet which is a permanent magnet cannot be demagnetized.
2.A solenoid produce a strong magnetic field whose strength can be changed by changing the current through it whereas the magnetic field of a permanent magnet is comparatively weak and its strength cannot be changed.
3. The polarity of a solenoid can be reversed by changing the direction of current through it whereas the polarity of permanent magnet is fixed and cannot be easily reversed.
2.A solenoid produce a strong magnetic field whose strength can be changed by changing the current through it whereas the magnetic field of a permanent magnet is comparatively weak and its strength cannot be changed.
3. The polarity of a solenoid can be reversed by changing the direction of current through it whereas the polarity of permanent magnet is fixed and cannot be easily reversed.
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Answer:
Permanent magnet: It is a natural magnet. There are no external ways to increase magnetism. Its polarity cannot be changed.
Solenoid: It is an artificial magnet. Its magnetism can be changed with the help of the current flowing through the solenoid and the number of turns. Its polarity can be changed.
Explanation:
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