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NEET UG PHYSICS MCQ: MAGNETISM AND MATTER
1
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Analyzing
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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(R): The magnetic permeability of iron is low.
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Correct option: C
If (A) is true but the (R) is false
Option C (If (A) is true but the (R) is false) is correct because the magnetic field inside a closed iron box is less due to the high permeability of iron, not low permeability.
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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 Force between two identical short bar magnets whose centers are metre apart is 8.1 N, when their axes are along the same line. If separation is increased to 3 and the axis are rearranged perpendicularly, the force between them would become
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 Force between two identical short bar magnets whose centers are metre apart is 8.1 N, when their axes are along the same line. If separation is increased to 3 and the axis are rearranged perpendicularly, the force between them would become
