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A sample of cast iron exhibits a magneti...

A sample of cast iron exhibits a magnetic field B = 0.5 T , when intensity of magnetising field (H) is `10""(A)/(m)`.
(i) Find permeability of iron .
(ii) What would be the field in air for this value of H ?

Text Solution

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(i) `mu = (B)/(H) = (0.5)/(10) = (5)/(100) = (1)/(20) = 0.05 T (m)/(A)`
(ii)` B_(0) = mu _(0)H = 4pi 10 ^(-7) xx 10 (A)/(m ) = 4pi xx 10 ^(-6) T`
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