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In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be

0.5 T
less than 0.5 T
more than 0.5 T
0.5 T or more or less

Correct Answer: less than 0.5 T

Explanation:

Because cast iron has lower permeability than silicon steel.

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