JEE PHYSICS MCQ: MAGNETISM AND MATTER

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A bar magnet of magnetic moment

4.0 \mathrm{~A}-\mathrm{m} 2

is free to rotate about a vertical axis through its center. The magnet is released from rest from east-west position. Kinetic energy of the magnet in north-south position will be

(\mathrm{H}=25 \mu \mathrm{T})

View answer and explanation

Correct option: B

10^{-4} \mathrm{~J}

Option B (

10^{-4} \mathrm{~J}

) is correct because the kinetic energy gained is equal to the loss in potential energy as the magnet rotates from the east-west to the north-south position.

More Questions from MAGNETISM AND MATTER

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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