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Vivek Kohli
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Asked: 2025-02-21T05:16:28+00:00 In:

In Wheatstone’s bridge, all the four arms have equal resistance R. If resistance of the galvanometer arm is also R, then equivalent resistance of the combination is

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Poll Results

66.67%(a) R ( 2 voters )
33.33%(b) 2 R ( 1 voter )
0%(C) R/2
0%(d) R/4
Based On 3 Votes

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The Wheatstone bridge is balanced since all four arms have equal resistance R. The galvanometer arm also has resistance R. The equivalent resistance of the entire network simplifies to R, using series-parallel reduction. Hence, the correct answer is (a) R.
Class 12th Science Physics NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.

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    1 Answer

    1. In a balanced Wheatstone bridge, the central galvanometer branch can be ignored.

      The two parallel arms each have resistance 2R, and their equivalent resistance is:

      Req = 2R×2R/2R +2R = R
      Answer: (a) R

      For more visit here:
      https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-3/

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