wheatstone bridge balance

Question

Balance condition for Wheatstone bridge (arms P, Q, R, S)?

RankGuru · Accepted Answer

1. **Wheatstone Bridge**: A circuit consisting of four resistors arranged in a diamond shape used to measure unknown resistance.
2. **Balance Condition**: The bridge is balanced when no current flows through the galvanometer connected across the diagonal.
3. **Requirement**: For zero galvanometer current, the potential at both its connection points must be equal.
4. **Mathematical Ratio**: This occurs when the products of opposite arm resistances are equal, or more commonly, the ratio of adjacent arms is equal:
   $\frac{P}{Q} = \frac{R}{S}$
5. **Usage**: If $P, Q,$ and $R$ are known, the unknown resistance $S$ can be calculated exactly.

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wheatstone bridge balance

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