JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Two short bar magnets of moments '

M

' and

\sqrt{3} M^{\prime}

are joined like a cross (+) This cross suspended from its centre with its plane horizontal in the earth's magnetic field. When the cross comes to equilibrium, angle made by the weaker magnet with the earth's magnetic field

B_H

View answer and explanation

Correct option: D

60^{\circ}

Option D (

60^{\circ}

) is correct because the angle made by the weaker magnet with the earth's magnetic field is 60 degrees when the torques are balanced.

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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