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NEET UG PHYSICS MCQ: MAGNETISM AND MATTER

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The unit of

\frac{\mu_{0}}{4 \pi}

is

View answer and explanation

Correct option: B

N A^{-2}

Option B is correct because the unit of

\frac{\mu_{0}}{4 \pi}

is

N A^{-2}

, derived from the Biot-Savart law or Ampere's law.

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Assertion: If a unit north pole rotates around a current carrying wire then work has to be done.
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. Then magnetic flux linked with the coil is [Wb] The area of hysteresis loop of a material is equivalent to

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) A bar magnet of moment

M

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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.