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NEET UG PHYSICS MCQ: MAGNETISM AND MATTER
1
Medium
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Application
+4 | -1
A compass needle placed at a distance from a short magnet in a tan position shows a deflection of 60. If the distance is increased to , the deflection of compass needle is
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Correct option: A
30
Option A (30) is correct because the magnetic field due to a short magnet varies inversely with the cube of the distance.
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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.