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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?

187 At
30 At
300 At
18.75 At

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

zero
little
lower
higher

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Magnetism and Electromagnetism
When the north poles of two bar magnets are brought close together, there will be

no force
a downward force
a force of repulsion
a force of attraction

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Magnetism and Electromagnetism
Strength of an electromagnet can be increased by

All of the listed here
Increasing the cross-sectional area
Increasing the number of turns
Increasing current supply

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Magnetism and Electromagnetism
The unit of relative permeability is

Its dimensionless
Hennry
None of the listed here
Hennry/meter

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

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

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MORE MCQ ON Magnetism and Electromagnetism

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