Q151 / 160 · TS EAMCET 2020 (14 Sep Shift 2) · Physics

Which of the following is desirable for making permanent magnets?

A
Low coercive field and low retentivity
B
Low coercive field and high retentivity
Correct answer
C
High coercive field and high retentivity
D
High coercive field and low retentivity

Solution

The material used for making permanent magnet must have high retentivity, so that it produces a strong magnetic field and must have high coercivity, so that its magnetisation is not destroyed by stray magnetic fields, temperature variations or minor mechanical damage.

Hence, the correct answer is option: 'C'.

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