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If P, Q, R and S are the resistances in ...

If P, Q, R and S are the resistances in the arms of Wheatstone bridge, then the bridge is most sensitive, when :

A

`P = Q = R = S`

B

`P = Q` and `R = S`

C

`P+Q = R+S`

D

`P-Q = R-S`.

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