JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Aurora Borealis is a luminous electrical discharge in the upper layers of the atmosphere, which is visible more frequently in

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Correct option: D

Regions of earth’s magnetic poles

Option D (Regions of earth’s magnetic poles) is correct because Aurora Borealis occurs more frequently near the Earth's magnetic poles due to the interaction of charged particles from the sun with the Earth's magnetic field.

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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