4.
The material which is not suitable for making a permanent magnet is
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Explanation:
Pure iron or the soft iron is not used for making permanent magnets, because this type of ironcannot retain the magnetic power for a long time.Permanent magnets can produce electricity with the help of a rotating coil,inside a electrical
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Iron is not suitable for making a permanent magnet
Explanation:
- Materials for making permanent magnets should have high coercivity so that magnetization is not erased by stray magnetic fields, temperature fluctuations or minor mechanical damages. Soft iron/pure iron has much smaller coercivity.
- Alnico, Cobalt steel and ticonal are used for making permanent magnets
- An efficient way to make a permanent magnet is to place a ferromagnetic rod in a solenoid and pass a current. The magnetic field of the solenoid magnetises the rod.
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