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A magnetising field intensity of 10Am^(-...

A magnetising field intensity of `10Am^(-1)` is applied on a sample of ferromagnetic material of susceptibility `1999`.The net magnetic field inside the material is

A

`4π × 10^(-6)` T

B

`4π×1999×10^(-6)` T

C

`8π×10^(-3)` T

D

`4π×1998×10^(-6)` T

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