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Magnetism and Electromagnetism

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?

300 AT
0.3 AT
30 AT
3 AT

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

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

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Magnetism and Electromagnetism
The materials are a bit inferior conductors of magnetic flux than air.

None of the listed here
Diamagnetic
Ferromagnetic
Dielectric

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

Rubbing with another magnet
Induction
The use of permanent magnet
Placing it inside a coil carrying current

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Magnetism and Electromagnetism
The ratio of intensity of magnetisation to the magnetisation force is known as

Relatice permeability
Flux density
None of the listed here
Susceptibility

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Magnetism and Electromagnetism
The attraction capacity of electromagnet will increase if the

Flux density decreases
Core length increases
Flux density increases
Core area increases

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MORE MCQ ON Magnetism and Electromagnetism

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