"The polarity of a bar magnet is fixed and cannot be changed." what does it means?
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The polarity of a bar magnet is fixed and cannot be changed. An electromagnet is a temporary magnet. It produces a very strong magnetic force. ... The polarity of an electromagnet can be changed by changing the direction of current in its coil.
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It means that the poles of a bar magnet cannot be exchanged or switched. Ex-The North Pole of a bar magnet will always be the North Pole and south pole and vice versa
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