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The space within a current carrying toro...

The space within a current carrying toroid is filled with tungsten of susceptibility `6.8 xx 10^-5`. The percentage increase in the magneticfield is

A

`2.8 xx 10^-3`

B

`6.8 xx 10^-3`

C

`4.8 xx 10^-3`

D

`5.8 xx 10^-3`

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