How does an electromagnet differ forma permanent magnet?
|1.||It is a temporary magnet.||
|As the name suggests, it is a permanent magnet.|
|2.||It can produce very strong magnetic force.||2.||It produces a comparatively weak magnetic field.|
|3.||Its polarity can be changed by changing the direction of current in the coil.||3.||Its polarity is fixed and cannot be changed.|
|4.||Its strength can be changed by changing the number of turns or by changing the current.||4.||Its strength cannot be changed.|
Concept: Electromagnetic Induction
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