NEET UG PHYSICS MCQ: MAGNETISM AND MATTER

1 Medium

1 of 1

Analyzing +4 | -1

Assertion (A): Time period of vibrations of a pair of magnets in sum position is always smaller than in difference position.

Reason (R):

\mathrm{T}=2 \pi \sqrt{I / M B_H}

, where symbols have their standard meaning.

View answer and explanation

Correct option: A

If both (A) and (R) are true and the (R) is a correct explanation of the (A)

Option A (If both (A) and (R) are true and the (R) is a correct explanation of the (A)) is correct because the time period is inversely proportional to the magnetic moment, which is greater in the sum position.

More Questions from MAGNETISM AND MATTER

Practice All Chapter MCQs →

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

\vec A = 2\vec i - 3\vec j + 6\vec k\,{m^2}

flux density vector

\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

250\;joule

. When

10\;kg

material is magnetized by an alternating field of

50\;Hz

then energy lost in one hour will be (density of material is

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.