Wheatstone Bridge
In a balanced Wheatstone bridge, if P = 10 Ω, Q = 20 Ω, and R = 15 Ω, what is S?
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- wheatstone bridge
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
30 Ω
- Balance Condition: A Wheatstone bridge is 'balanced' when the potential difference across the galvanometer is zero, meaning no current flows through it.
- Ratio Rule: QP=SR.
- Rearrange for S:
- S=R×PQ.
- Substitution:
- S=15×1020
- S=15×2=30 Ω.
- Result: The value of the unknown resistor S is 30 Ω.
This medium difficulty physics question is from the chapter current electricity, covering the topic of wheatstone bridge. It appeared in the 2025 exam.
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