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In the circuit shown, the correct relation for a balanced Wheatstone bridge is

1. S/R = Q/P
2. R/S = Q/P
3. Q/S = R/P
4. None of these

Correct answer: Q/S = R/P

Solution

In a balanced Wheatstone bridge, the ratio of resistances in one branch equals the ratio in the other branch. Thus, \(\frac{Q}{S} = \frac{R}{P}\), which is equivalent to the given correct option. This is the standard balance condition for zero galvanometer current.

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