MAGNETISM AND ELECTROMAGNETISM QUIZ

For which of the following materials the saturation value is the highest?

Diamagnetic materials

Paramagnetic materials

Ferromagnetic materials

Ferrites

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The change of cross-sectional area of conductor in magnetic field will affect

None of these

both of the listed here

reluctance of conductor

resistance of conductor

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Materials subjected to rapid reversal of magnetism should have

High co-ercivity and high retentivity

Large area of B-H loop

High permeability and low hysteresis loss

High co-ercivity and low density

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Which of the following is the unit of magnetic flux density?

Weber

Lumens

None of the listed here

Tesla

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

proportional to X

proportional to distance between the conductors

proportional to 7

inversely proportional to I

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

conducting material

diamagnetic material

ferromagnetic material

paramagnetic material

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Temporary magnets are used in

Generators

All of the listed here

Loud speakers

Motors

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One telsa is equal to

1 Wb/mm²

1 Wb/m

1 Wb/m²

1 mWb/m²

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

Number of turns of the coil

Pole strength of the magnet

Resistance of the coil

Motion of the magnet

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Which of the following is expected to have the maximum permeability ?

Brass

Copper

Zinc

Ebolite

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