NEET UG PHYSICS MCQ: MAGNETISM AND MATTER

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Application +4 | -1

At a temperature of

30^\circ

C, the susceptibility of a ferromagnetic material is found to be

&chi;

. Its susceptibility at

333^\circ

C is

View answer and explanation

Correct option: D

0.09\;&chi;

Option D is correct. According to the Curie-Weiss law, the susceptibility is inversely proportional to the absolute temperature above the Curie temperature.

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Assertion: If a unit north pole rotates around a current carrying wire then work has to be done.
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7.5\;gm/c{m^3}

) A bar magnet of moment

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. The torque acting on the magnet is Assertion(A): Earth's magnetic field inside a closed iron box is less as compared to the out side.

Reason(R): The magnetic permeability of iron is low.