JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Assertion (A): Time period of vibrations of a pair of magnets in sum position is always smaller than in difference position.

Reason (R):

\mathrm{T}=2 \pi \sqrt{I / M B_H}

, where symbols have their standard meaning.

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Correct option: A

If both (A) and (R) are true and the (R) is a correct explanation of the (A)

Option A (If both (A) and (R) are true and the (R) is a correct explanation of the (A)) is correct because the time period is inversely proportional to the square root of the magnetic moment, and the sum position has a larger effective magnetic moment.

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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

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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