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The work done in maving a unit n- pole r...

The work done in maving a unit `n-` pole round a conductor carrying current in a circle of radius `10cm` is `w`. The work done in moving it in a circle of radius `20cm` is

A

`w`

B

`2w`

C

`w//2`

D

`4w`

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Knowledge Check

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    A
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