Relation between permeability \( \mu \) and magnetizing P field \( ...

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Relation between permeability \( \mu \) and magnetizing
P
field \( H \) for a sample of iron \( \mu=\left(\frac{0.4}{H}+12 \times 10^{-4}\right) \).
W
Henry/meter.
Where unit of \( H \) is \( \mathrm{A} / \mathrm{m} \). Find value of \( \mathrm{H} \) for which magnetic induction of \( 1.0 \mathrm{~Wb} / \mathrm{m}^{2} \) can be produce.
(1) \( 200 \mathrm{~A} / \mathrm{m} \)
(2) \( 300 \mathrm{~A} / \mathrm{m} \)
(3) \( 400 \mathrm{~A} / \mathrm{m} \)
(4) \( 500 \mathrm{~A} / \mathrm{m} \)
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