NEET UG PHYSICS MCQ: MAGNETISM AND MATTER

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A magnet of magnetic moment

M

is freely suspended in a uniform magnetic field strength B. The work done is deflecting the magnet through an angle

\theta

is given by

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Correct option: D

\mathrm{MB}(1-\cos \theta)

Option D is correct because the work done in deflecting a magnet in a magnetic field is given by MB(1-cosθ), which represents the change in potential energy.

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Assertion: If a unit north pole rotates around a current carrying wire then work has to be done.
Reason: Magnetic field produced by current is always non - conservative in nature. The magnetic length of a bar magnet is 15 cm then its geometric length is If area vector

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\vec B = - 3\vec i + \vec j + 2\vec k\,\left( {Wb/{m^2}} \right)

. Then magnetic flux linked with the coil is [Wb] The area of hysteresis loop of a material is equivalent to

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. When

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7.5\;gm/c{m^3}

) A bar magnet of moment

M

is placed in the magnetic field

B

. The torque acting on the magnet is Assertion(A): Earth's magnetic field inside a closed iron box is less as compared to the out side.

Reason(R): The magnetic permeability of iron is low.