Wheatstone Bridge Balance
Balance condition for Wheatstone bridge (arms P, Q, R, S)?
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- wheatstone bridge balance
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
P/Q = R/S
- Wheatstone Bridge: A circuit consisting of four resistors arranged in a diamond shape used to measure unknown resistance.
- Balance Condition: The bridge is balanced when no current flows through the galvanometer connected across the diagonal.
- Requirement: For zero galvanometer current, the potential at both its connection points must be equal.
- Mathematical Ratio: This occurs when the products of opposite arm resistances are equal, or more commonly, the ratio of adjacent arms is equal: QP=SR
- Usage: If P,Q, and R are known, the unknown resistance S can be calculated exactly.
This hard difficulty physics question is from the chapter current electricity, covering the topic of wheatstone bridge balance. It appeared in the 2025 exam.
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