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The equation of a balanced Wheatstone bridge is PR = QS.

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in Physics – Class 12 by (135k points)
The equation of a balanced Wheatstone bridge is PR = QS.

(a) True

(b) False

The question was posed to me during a job interview.

Query is from Wheatstone Bridge topic in chapter Current Electricity of Physics – Class 12

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The correct option is (b) False

The explanation: No. A Wheatstone bridge is an electrical device used to measure unknown resistance by placing it in one of the branches and balancing the two legs of the bridge. If R is the unknown resistance, S is varied until the galvanometer shows null deflection, whereas P and Q are fixed. This is the balanced condition. So the equation is \(\frac {P}{Q} = \frac {R}{S}\)  →  PS = QR. Also, in the balanced condition, no current passes through the galvanometer.

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