JEE Main 2024 Physics question
The resistance per centimeter of a meter bridge wire is r, with X Ω resistance in left gap. Balancing length from left end is at 40 cm with 25 Ω resistance in right gap. Now the wire is replaced by another wire of 2r resistance per centimeter. The new balancing length for same settings will be at
Answer: (C)
Solution
At balance X/R = ℓ₁/ℓ₂, which depends only on the ratio of the lengths and
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