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
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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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.
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