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Properties of Electromagnet

Mention five ...

Question

Mention five differences between an electromagnet and permanent magnet.

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Solution

$\begin{matrix} E l e c t r o m a g n e t & P e r m a n e n t m a g n e t 1. I t i s a t e m p o r a r y m a g n e t a n d c a n b e d e m a g n e t i z e d & 1. I t i s a p e r m a n e n t m a g n e t a n d c a n n o t b e d e m a g n e t i z e d e a s i l y 2. M a g n e t i c s t r e n g t h c a n b e c h a n g e d & 2. I t s s t r e n g t h i s f i x e d 3. I t s p o l a r i t y c a n a l s o b e c h a n g e d & 3. I t s p o l a r i t y i s f i x e d 4. I t i s p r e p a r e d f r o m s o f t i r o n & 4. I t i s p r e p a r e d f r o m h a r d s t e e l 5. D i r e c t i o n o f m a g n e t i c f i e l d c a n b e r e v e r s e d & 5. D i r e c t i o n o f m a g n e t i c f i e l d c a n n o t b e r e v e r s e d 6. M a g n e t i c f i e l d i s p r o d u c e d w h e n e l e c t r i c c u r r e n t f l o w s . & 6. E l e c t r i c c u r r e n t i s n o t r e q u i r e d t o p r o d u c e m a g n e t i c f i e l d . \end{matrix}$

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Q. (a) How does an electromagnet differ forma permanent magnet?
(b) Name two devices in which electromagnets are used and two devices where permanent magnets are used.

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