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Physics · Current Electricity

JEE Main 2024 — 31 January, Shift 2 — Question 37

The resistance per centimeter of a meter bridge wire is rr, with XΩX \Omega resistance in left gap. Balancing length from left end is at 40 cm with 25Ω25 \Omega resistance in right gap. Now the wire is replaced by another wire of 2 r resistance per centimeter. The new balancing length for same settings will be at

  1. Option A:

    20 cm

  2. Option B:

    10 cm

  3. Option C:

    80 cm

  4. Option D:

    40 cm

    Correct

Answer: D

Step-by-step solution

From (i) and (ii) ℓ2′=ℓ2=40 cm\ell_{2}^{\prime}=\ell_{2}=40 \mathrm{~cm}

Solution figure

Answer key and solution verified before publishing.

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Exam
JEE Main 2024
Paper
31 January, Shift 2
Subject
Physics
Chapter
Current Electricity
Topic
Electrical Measuring Instruments

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