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Question

Among the following _____ has the highest retentivity.
aluminium
steel
nickel
soft iron

A

aluminium

B

nickel

C

steel

D

soft iron

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Solution

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The power of magnetism after the inducing agency is removed, is called Retentivity of a substance.

Retentivity is used for remanence measured in units of magnetic flux density.
steel retains magneto-field longer, iron acquires the field easier but decays sooner.

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