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In a metre bridge a copper coil is conne...

In a metre bridge a copper coil is connected in the right gap and a resistance of `10 Omega` in the left gap. The balance point is obtained at 0.2 m. The resistance of the coil is

A

`40 Omega`

B

`5 Omega`

C

`20 Omega`

D

`2.5 Omega`.

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