Question

Very Important Question ...

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.​

Answer 1

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⏭️ Why is pure iron not used for making permanent magnets?

▶️ Pure iron cannot retain its magnetism for long time. Hence it cannot be used for making permanent magnets.

⏭️ Name one material used for making permanent magnets.

▶️Cobalt-steel or some alloys of iron such as ALNICO are used for making permanent magnet.

⏭️ Describe how permanent magnets are made electrically.

▶️For the formation of permanent magnet electrically a current carrying solenoid is used to magnetise steel rod.Steel rod is kept inside the solenoid.. A strong uniform magnetic field produced by the current carrying solenoid magnetise it.The magnet so formed retains the magnetism even after switching off the current in solenoid.

▶️ Permanent magnets are used in like (i) Galvanometer and (ii) loudspeakers

Answer 2

Heya Mate............

Pure iron cannot retain its magnetism for long time. Hence it cannot be used for making permanent magnets.

Cobalt-steel or some alloys of iron such as ALNICO are used for making permanent magnet.

For the formation of permanent magnet electrically a current carrying solenoid is used to magnetise steel rod.Steel rod is kept inside the solenoid.. A strong uniform magnetic field produced by the current carrying solenoid magnetise it.The magnet so formed retains the magnetism even after switching off the current in solenoid.

Permanent magnets are used in like :

(i) Galvanometer

(ii) loudspeakers