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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

240 At
2,400 At
2.4 At
24 At

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

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

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Magnetism and Electromagnetism
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

increases
decreases
reverses polarity
remains unchanged

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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?

30 At
18.75 At
300 At
187 At

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Magnetism and Electromagnetism
Magnetic moment is a

pole strength
vector quantity
scalar quantity
universal constant

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

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

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MORE MCQ ON Magnetism and Electromagnetism

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