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Assertion : Ferromagnetic substances attracts the external magnetic field lines
Reason : Permeability of ferromagnetic substance is Iow.
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Important Questions on Matter and Magnetism
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Assertion: We cannot think of magnetic field configuration with three poles.
Reason: A bar magnet does exert a torque on itself due to its own field.
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Assertion: The true geographic north direction is found by using a compass needle.
Reason: The magnetic meridian of the earth is along the axis of rotation of the earth.
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Assertion : A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It will stay in any direction.
Reason : At geomagnetic pole BH = 0 (1).
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Assertion : MnO2 is ferromagnetic.
Reason : Domains are equally aligned in parallel and anti parallel direction
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Assertion : Magnetic susceptibility of diamagnetic substance is small negative.
Reason : Diamagnetic substance have unpaired electron
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Assertion : Super conductors' can be easily levitated in strong magnetic field.
Reason : Magnetic susceptibility of superconductor is extremely positive.
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If a bar magnet is dropped vertically into a, long copper tube then its final acceleration will be:-
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Assertion :- If a steel core is used in a transformer in place of soft iron core then hysteresis losses are increased
Reason : Steel core is easily magnetised but it is not easily demagnetised by the alternating magnetic field.
