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When the value of r in the balanced Whea...

When the value of r in the balanced Wheatstone bridge, shown in the figure: is increased from `5 Omega` to `7 Omega` the value of S has to be increased by `3 Omega` in order to maintain the balance. What is the initial value of S ?

A

`2.5 Omega`

B

`3 Omega`

C

`5 Omega`

D

`7.5 Omega`

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