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JEE PHYSICS MCQ: MAGNETISM AND MATTER

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The magnetic susceptibility of a substance at room temperature is

-0.0002.

The susceptibility when the temperature is increased by

2^{\circ} \mathrm{C},

will be

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Correct option: C

-0.0002

Option C (-0.0002) is correct because the magnetic susceptibility of a diamagnetic substance is independent of temperature.

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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}}

\mu_{\mathrm{f}}

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