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Magnetism and Electromagnetism

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

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

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Magnetism and Electromagnetism
What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

240 At
2,400 At
24 At
2.4 At

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Magnetism and Electromagnetism
A material which is slightly repelled by a magnetic field is known as

ferromagnetic material
diamagnetic material
conducting material
paramagnetic material

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Magnetism and Electromagnetism
The use of permanent magnets is. not made in

Loud speakers
Transformers
None of the listed here
Energy meters

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Magnetism and Electromagnetism
When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon

Pole strength of the magnet
Motion of the magnet
Resistance of the coil
Number of turns of the coil

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Magnetism and Electromagnetism
The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is

proportional to 7
proportional to distance between the conductors
inversely proportional to I
proportional to X

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