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Earn 100
Assertion: The ferromagnetic substances do not obey Curie's law.
Reason: At Curie point, ferromagnetic substances start behaving as a paramagnetic substance.
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Important Questions on Matter and Magnetism
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Assertion: The properties of paramagnetic and ferromagnetic substances are not affected by heating.
Reason: As temperature rises, the alignment of molecular magnets gradually decreases.
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Assertion : The susceptibility of diamagnetic materials does not depent upon temperature, Reason : Every atom of a diamagnetic material is not a complete magnet in itsself.
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Assertion : For a perfectly diamagnetic substance permeability is always one.
Reason : The ability of a material to permit the passage of magnetic lines of force through it is called magnetic permeability.
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Assertion: Diamagnetic materials can exhibit magnetism.
Reason: Diamagnetic materials have a permanent magnetic dipole moment.
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Assertion : Ferromagnetic substances attracts the external magnetic field lines
Reason : Permeability of ferromagnetic substance is Iow.
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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).
