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Assertion : A linear solenoid carrying current is equivalent to a bar magnet.
Reason : The magnetic field lines due to current carrying solenoid resemble exactly with those of a bar magnet
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Important Questions on Matter and Magnetism
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Assertion : The permanent magnetic moment of the atoms of a material is zero. The material must be diamagnetic.
Reason : Hard magnetic materials have high retantivity high, coresivity and high hysteresis loss & are suitable for permanent magnet.
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Assertion : A magnet may levitated above a superconducting material
Reason : There is always repulsive force between a diamagnet and a magnet! that produces non uniform magnetic field
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Assertion : Magnetic mot-pent of helium atom is zero.
Reason : All the electron are paired in helium atom orbitals.
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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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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.
