When a wire of uniform cross section $a$, length $l$ and resistance $R$ is into a complete circle, resistance between any two of diametrically opposite point will be:

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Aicharya · Accepted Answer

Both are in parallel $\begin{aligned} & \frac{1}{R^{\prime}}=\frac{2}{R}+\frac{2}{R}=\frac{4}{R} \ & \Rightarrow \quad R^{\prime}=\frac{R}{4} \end{aligned}$

When a wire of uniform cross section $a$, length $l$ and resistance $R$ is into a complete circle,…

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