JEE PHYSICS MCQ: MAGNETISM AND MATTER

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The torque on a bar magnet due to the earth’ magnetic field is maximum when the axis of the magnet is

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Correct option: A

Perpendicular to the field of the earth

Option A is correct. The torque on a bar magnet is maximum when the angle between the magnetic moment and the magnetic field is 90 degrees, which means the axis of the magnet is perpendicular to the 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

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

and

\mu_{\mathrm{f}}

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