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Four resistance 10 Omega, 10 Omega,10 Om...

Four resistance `10 Omega`, `10 Omega`,`10 Omega` and `20 Omega` are connected so as to form Wheatstone's bridge. The resistance connected across `20 Omega` resistance to balance the bridge is

A

`10 Omega`

B

`20 Omega`

C

`30 Omega`

D

`40 Omega`

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