The relation between $\mu$ and $H$ for a specimen of iron is $\mu = [\frac{0.4}{H} + 12 \times 10^{-4}] \ H m^{-1}$. The value of $H$ which produces a flux density of $1 \ T$ will be ($\mu =$ magnetic permeability,$H =$ magnetic intensity).

  • A
    $250 \ A m^{-1}$
  • B
    $500 \ A m^{-1}$
  • C
    $750 \ A m^{-1}$
  • D
    $10^3 \ A m^{-1}$

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