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A Wheatstone bridge consisting of four a...

A Wheatstone bridge consisting of four arms of resistances P, Q, R and S is most sensitive when
(1) all the resistances are equal
(2) all the resistances are unequal
(3) the resistances P and Q are equal but R >> P and S >> Q
(4) the resistances P and Q are equal but R << P and S<< Q

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