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NEET UG PHYSICS MCQ: MAGNETISM AND MATTER
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A bar magnet of length 0.2m and with a magnetic moment of is placed in a uniform magnetic field of intensity 0.8 T, with is axis making an angle of with the field. What is the torque on the magnet?
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Correct option: C
4 N-m
Option D is correct because the torque is calculated using the formula τ = MBsinθ, and substituting the given values yields 4 N-m.
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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 flux density vector . Then magnetic flux linked with the coil is [Wb] The area of hysteresis loop of a material is equivalent to . When material is magnetized by an alternating field of then energy lost in one hour will be (density of material is ) A bar magnet of moment is placed in the magnetic field . 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.
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 flux density vector . Then magnetic flux linked with the coil is [Wb] The area of hysteresis loop of a material is equivalent to . When material is magnetized by an alternating field of then energy lost in one hour will be (density of material is ) A bar magnet of moment is placed in the magnetic field . 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.