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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The main constituent of permalloy is

Tungsten
Nickel
Chromium
Cobalt

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Magnetism and Electromagnetism
The ability of a material to remain magnetized after removal of the magnetizing force is known as

retentivity
hysteresis
reluctance
permeability

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Magnetism and Electromagnetism
The unit for permeability is

At/m
At/Wb
Wb
Wb/At × m

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

Soft iron
None of the listed here
Stainless steel
Hardened steel

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Magnetism and Electromagnetism
Materials subjected to rapid reversal of magnetism should have

Large area of B-H loop
High permeability and low hysteresis loss
High co-ercivity and low density
High co-ercivity and high retentivity

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

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

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MORE MCQ ON Magnetism and Electromagnetism

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