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Magnetism and Electromagnetism

Magnetism and Electromagnetism
A magnetic field exists around

Aluminium
Copper
Moving Charges
Iron

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Magnetism and Electromagnetism
Temporary magnets are used in

Motors
Generators
All of the listed here
Loud speakers

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Magnetism and Electromagnetism
Which of the following is a ferromagnetic material?

Aluminium
Tungsten
Nickel
Copper

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Magnetism and Electromagnetism
Indicate which of the following material does not retain magnetism permanently.

Stainless steel
Soft iron
None of the listed here
Hardened steel

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Magnetism and Electromagnetism
The magnetism left in the iron after exciting field has been removed is known as

reluctance
susceptance
residual magnetism
permeance

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

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

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