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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

300 At
18.75 At
187 At
30 At

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Magnetism and Electromagnetism
Ferrites are materials.

Paramagnetic
Diamagnetic
None of the listed here
Ferromagnetic

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Magnetism and Electromagnetism
For a given wire-wound core, an increase in current through the coil

Reverses the flux lines
Decreases the flux density
Causes no change in flux density
Increases the flux density

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Magnetism and Electromagnetism
A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

270
360
180
90

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Magnetism and Electromagnetism
The relative permeability is less than unity is case of

Diamagnetic material
Ferrits
Paramagnetic material
Ferromagnetic material

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

conducting material
ferromagnetic material
paramagnetic material
diamagnetic material

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MORE MCQ ON Magnetism and Electromagnetism

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