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CBSE Class 10 Answered

Why is pure iron not used for making permanent magnets? Name one material used for making permanent magnets. Describe how permanent magnets are made electrically. State two examples of electrical instruments made by using permanent magnets.
Asked by prabal | 14 Mar, 2018, 09:28: AM
answered-by-expert Expert Answer
Materials for making permanent magnets should have high coercivity so that magnetisation 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.
 
permanent magnets are used in loud speakers, telephone diaphragms.
Answered by Thiyagarajan K | 19 Mar, 2018, 01:09: PM

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