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Magnetism and Electromagnetism

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

Soft iron
Hardened steel
Stainless steel
None of the listed here

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

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

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Magnetism and Electromagnetism
A permeable substance is one

which is a good conductor
which is a bad conductor
through which the magnetic lines of force can pass very easily
which is a strong magnet

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Magnetism and Electromagnetism
The retentivity of material is useful for the construction of

Electromagnets
Non-magnetic substances
Transformers
Permanent magnets

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Magnetism and Electromagnetism
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Remain same
Decreases
Increases
None of the listed here

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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?

150 At
300 At
200 At
100 At

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