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Magnetism and Electromagnetism

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

zero
little
higher
lower

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Magnetism and Electromagnetism
The Biotsavart's law is a general modification of

Ampere's law
Kirchhoff's law
Lenz's law
Faraday's laws

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Magnetism and Electromagnetism
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

11 At/Wb
111 At/Wb
1 At/Wb
1111 At/Wb

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

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

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

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

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Magnetism and Electromagnetism
The unit of flux is the same as that of

Pole strength
Permanance
Reluctance
Resistance

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MORE MCQ ON Magnetism and Electromagnetism

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