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A magnetic field strength (H) 3 xx 10^3 ...

A magnetic field strength (H) `3 xx 10^3 Am^-1` produces a magnetic field of induction (B) of `12 pi T` in an iron rod . The relative permeability of iron is

A

`10^5`

B

`10^4`

C

`10^3`

D

`10^2`

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