CBSE Class 7 Answered
Give two advantages of electromagnets over permanent magnets.
Asked by Topperlearning User | 29 Apr, 2014, 03:17: PM
Expert Answer
1. The magnetism of an electromagnet can be switched on or switched off as desired. This is not possible with a permanent magnet.
2. An electromagnet can be made very strong by increasing the number of turns in the coil, and by increasing the current passing through the coil. On the other hand, a permanent magnet cannot be made so strong.
Answered by | 29 Apr, 2014, 05:17: PM
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