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Electromagnets are made of soft iron because soft iron has:
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Important Questions on Matter and Magnetism
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A vibration magnetometer placed in magnetic meredian has a samll bar magnet. The magnet executes oscillations with a time period of in Earth’s horizontal magnetic field of microtesla. When a horizontal magnetic field microtesla is produced opposite to the Eart’s field by placing a current-carrying wire, the new time period of magnet will be :
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The magnetic moment of a diamagnetic atom is
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There are four light weight samples separately suspended by threads. A bar magnet is slowly brought near each sample and following observations are noted :
(i) is feebly repelled (ii) is feebly attracted
(iii) is strongly attracted (iv) remains unaffected
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Which is a diamagnetic material?
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The magnetic susceptibility is negative for
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Which is ferromagnetic?
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If and be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip is given by:-
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A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched ON, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence, the rod gains gravitational potential energy. The work required to do this comes from
