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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The magnetic materials exhibit the property of magnetisation because of

spin of nucleus
either of these
orbital motion of electrons
spin of electrons

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Magnetism and Electromagnetism
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

reverses polarity
decreases
remains unchanged
increases

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Magnetism and Electromagnetism
The ability of a material to remain magnetized after removal of the magnetizing force is known as

retentivity
permeability
reluctance
hysteresis

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Magnetism and Electromagnetism
Ferrites are materials.

None of the listed here
Paramagnetic
Ferromagnetic
Diamagnetic

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Magnetism and Electromagnetism
A permeable substance is one

Which is a bad conductor
Which is a strong magnet
Which is a good conductor
Through which the magnetic lines of force can pass very easily

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Magnetism and Electromagnetism
Air gap has_______eluctance as compared to iron or steel path

lower
higher
little
zero

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