JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Assertion (A): For making permanent magnets, steel is preferred over soft iron.

Reason (R): As retantivity of steel is smaller.

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Correct option: C

If (A) is true but the (R) is false

Option C (If (A) is true but the (R) is false) is correct because steel is preferred for permanent magnets due to its high retentivity, not smaller retentivity.

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Curie temperature is the one above which A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is

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\mu_{\mathrm{d}}, \mu_{\mathrm{p}}

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