NEET UG PHYSICS MCQ: MAGNETISM AND MATTER

1 Medium

1 of 1

Application +4 | -1

A bar magnet of magnetic moment 3.0 A-

{m^2}

is placed in a uniform magnetic induction field of

2 \times {10^{ - 5}}T

. If each pole of the magnet experiences a force of

6 \times {10^{ - 4}}N

, the length of the magnet is

View answer and explanation

Correct option: D

0.1

m

Option D is correct because the length of the magnet is calculated using the formula relating force, magnetic moment, and magnetic field, resulting in 0.1 m.

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.