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A magnetising field intensity of 1000 A/...

A magnetising field intensity of 1000 `A/m`produces a magnetic flux density 0.25 `(Wb)/ m^2` in a ferromagnetic substance. The relative permeability of ferromagnetic substance is (Approximately)

A

A. `2.0 * 10^4`

B

B. `2.0 * 10^2`

C

C. `4.0 * 10^3`

D

D. `1.0 * 10^5`

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