Meter Bridge
In a meter bridge, a known resistance of 6 Ω in the right gap is balanced by an unknown resistance in the left gap. If the balance point is at 40 cm from the left end, what is the unknown resistance?
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- meter bridge
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
4 Ω
- Bridge Balance Condition: SR=100−ll.
- Identify Given Data:
- Balance length from left l=40 cm.
- Resistance in right gap S=6 Ω.
- Unknown in left gap R=?
- Calculation:
- 6R=6040=32
- R=6×32=4 Ω.
- Conclusion: The unknown resistance is 4 Ω.
This medium difficulty physics question is from the chapter current electricity, covering the topic of meter bridge. It appeared in the 2025 exam.
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