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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Temporary magnets are used in

All of the listed here
Loud speakers
Generators
Motors

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

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

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Magnetism and Electromagnetism
The unit for reluctance is

At/Wb
Wb
tesla
At/m

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Magnetism and Electromagnetism
The magnetic materials exhibit the property of magnetisation because of

orbital motion of electrons
spin of electrons
spin of nucleus
either of these

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

slightly less than unity
equal to unity
equal to that ferromagnetic mate rials
slightly more than unity

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Magnetism and Electromagnetism
A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be

2.4 N
0.24 N
240 N
24 N

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MORE MCQ ON Magnetism and Electromagnetism

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