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A permanent magnet cannot be used in the electric bell.Why?

A permanent magnet cannot be used in the electric bell.Why?

Grade:10

2 Answers

Arun
25758 Points
2 years ago
steel an form weak permanent magnets. Whereas ""soft"" irons cannot be permanently magnetized. The leftover magnetization causes inefficiency, since some electrical energy is wasted to reverse that magnetization during the next cycle.
Vikas TU
14149 Points
2 years ago
Dear student 
 because permanent magnets loose their property after some time whereas we can change the properties of electromagnet.
Hope this helps 
Good Luck 

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