Physics-

General

Easy

Question

# If the curves of two samples of P and Q of iron are as shown below, then which one of the following statements is correct?

- Both P and Q are suitable for making permanent magnet
- P is suitable for making permanent magnet and Q for making electromagnet
- P is suitable for making electromagnet and Qis suitable for permanent magnet
- Both P and Q are suitable for making electromagnets

## The correct answer is: P is suitable for making permanent magnet and Q for making electromagnet

### For permanent magnet we prefer a material with high retentivity (so as to make a stronger magnet) and high coercivity (so that magnetization may not be wiped out easily). For electromagnet we prefer high saturated magnetism, low coercivity and least possible area of hysteresis loop so that electromagnet develops high magnetization, is easily demagnetized and energy loss in a magnetization cycle is least. Therefore, Pis suitable for making permanent magnet and Q for making electromagnet.

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