A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistances P and Q: [Diagram: A Wheatstone bridge circuit with resistances P, Q, X, Y. A galvanometer G is connected between the junction of P and X, and the junction of Q and Y. A battery E is connected across the other two junctions.]

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Should be approximately equal and are small

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