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A square shaped wire with resistance of each side 3 \Omega is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in unit of \Omega will be____________. Given--
 

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Let Resistance of arch semi-circle be R
Total \: resistance \: of \: square\: wire= 4\left ( 3 \right )= 2R
R= 6\Omega
R_{AB}= \frac{R}{2}= 3\Omega
R_{AB}\rightarrow Resistance between two diametrically opposite points
 

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