JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Assertion (A) Above Curie temperature, a ferromagnetic material becomes paramagnetic.

Reason (R) When a magnetic material is heated to very high temperature, it loses its magnetic properties.

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Correct option: A

If both Assertion and Reason are true and Reason is correct explanation of Assertion

Option A (If both Assertion and Reason are true and Reason is correct explanation of Assertion) is correct because ferromagnetic materials lose their magnetic properties above the Curie temperature, becoming paramagnetic due to increased thermal agitation.

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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

{2^{5/4}}

s. One of the magnets is removed and if the other magnet oscillates in the same field , then the time period in second is The relative permeability of a substance

X

is slightly less than unity and that of substance

Y

is slightly more than unity, then A bar magnet is equivalent to If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by

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

and

\mu_{\mathrm{f}}

respectively, then :- Which of the following is most suitable for the core of electromagnets