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NEET 2005 (AIPMT) · Combination of Resistors

Combination of Resistors question from NEET 2005 (AIPMT)

Q74NEET 2005 · AIPMTEasy

Combination of Resistors

When a wire of uniform cross-section $a$ length $l$ and resistance R is bent into a complete circle. resistance between any two of diametrically opposite points will be

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Answer: (a)

Diametrically opposite points split the circle into two halves of $\dfrac{R}{2}$ each.
The halves are in parallel: $R_{eq} = \dfrac{(R/2)(R/2)}{R} = \dfrac{R}{4}$
So the answer is (a) $R/4$ .

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