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In a metre bridge when the resistance in...

In a metre bridge when the resistance in the left gap is `2Omega` and an unknown resistance in the right gap, the balance point is obtained at 40 cm from the zero end. On shunting the unknown resistance with `2Omega` find the shift of the balance point on the bridge wire.

A

65 cm

B

62.5 cm

C

20 cm

D

22.5 cm

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