Question

what is difference between parmanent magnet and bar magnet

Answer 1

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=> $Electromagnet$

•Electromagnet is a temporary magnet.
•It can produce very strong magnetic field.
•The polarity of electromagnet can be changed.

$Bar magnet$

•Bar magnet is permanent magnet.
•It exhibits magnetism for a long time even after the removal of the magnetising field.
•The polarity of permanent magnet cannot be changed.
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Answer 2

$\huge\bf\red{\mid{\overline {\underline {Answer}}} \mid}$

➊ Permanent magnet is not so strong, but electromagnet is very strong.

➋ The strength of permanent magnet can't be changed, but that of electromagnet can be changed by changing the number of turns or the amount of current.

➌ Permanent magnet has permanent magnetism, but the magnetism in electromagnet is temporary.

➍ The polarity of permanent magnet can't be changed, but that of an electromagnet can be changed by changing the position of positive and negative terminals.