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Gopal001 Das
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Asked: 2025-03-07T04:47:58+00:00 In:

A uniform wire of resistance 2 R is bent in the form of a circle. The effective resistance between the ends of any diameter of the circle is

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Poll Results

9.09%(a) 2 R ( 1 voter )
63.64%(b) R/2 ( 7 voters )
18.18%(c) R ( 2 voters )
9.09%(d) R/4 ( 1 voter )
Based On 11 Votes

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The wire is divided into two equal semicircles, each with resistance
R. These are in parallel, so the effective resistance is:
1/Reff = 1/R + 1/R
Thus, Reff = R/2.
Answer: (b) R/2.

Class 12th Science Physics NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.

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    1 Answer

    1. When the wire of resistance 2
      R is bent into a circle, each semicircular half has resistance
      R. These two halves are in parallel when measured across a diameter. The

      effective resistance is given by:
      1/Reff = 1/R + 1/R

      Reff = R /2

      Thus, the correct answer is (b) R/2.

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