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JEE PHYSICS MCQ: MAGNETISM AND MATTER

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A short bar magnet of magnetic moment

0.4\, \mathrm{J\,T}^{-1}

is placed in a uniform magnetic field of

0.16 \mathrm{~T}

. The magnet is stable equilibrium when the potential energy is :

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Correct option: D

-0.064 \mathrm{~J}

Option D (-0.064 J) is correct because it is calculated using the potential energy formula for a magnet in a magnetic field at stable equilibrium.

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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

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

\mu_{\mathrm{f}}

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