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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The retentivity of material is useful for the construction of

Non-magnetic substances
Electromagnets
Permanent magnets
Transformers

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

187 At
18.75 At
300 At
30 At

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

100 At
200 At
300 At
150 At

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

it has low permeability
it has high permeability
it corrodes easily
it has high specific gravity

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

Paramagnetic material
Ferromagnetic material
Ferrits
Diamagnetic material

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Magnetism and Electromagnetism
Fleming's left hand rule is used to find

Polarity of a magnetic pole
Direction of magnetic field due to current carrying conductor
Direction of flux in a solenoid
Direction of force on a current carrying conductor in a magnetic field

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