A Wheatstone bridge determines unknown resistance X by adjusting variable resistance Y. For most precise measurement of X, resistances P and Q: [Diagram: Image]
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A Wheatstone bridge determines unknown resistance X by adjusting variable resistance Y. For most precise measurement of X, resistances P and Q: [Diagram: Image]

G1 Physics · Accepted Answer

Step 1: Bridge sensitivity is strongest for comparable ratio-arm resistances. Step 2: Matched small P and Q provide sensitive null for the specified textbook idealization. Step 3: Select approximately equal and small.