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A magnetising field of 2 xx 10^(3) amp//...

A magnetising field of `2 xx 10^(3) amp//m` produces a magnetic flux density of `8pi` Tesla in an iron rod. The relative permeability of the rod will be

A

`10^(2)`

B

`10^(0)`

C

`10^(4)`

D

`10^(1)`

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