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False. A Wheatstone bridge comprises four arms which are termed as resistors and among which the ratio of two resistors is kept at a fixed value and the other two resistors or arms are left without any fixed value, that is, the remaining arms are balanced, among which one of them can be varied while the other arm left is the resistor of unknown value. Where R is the unknown resistance, P and Q are the ratio arm of the bridge, and S is the standard arm of the bridge and is varied until the galvanometer shows null deflection, whereas P and Q are fixed. So, the equation is P/Q=R/S → PS = QR.