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A wire of length 25 m and cross-sectional area 5 mm2 having resistivity of 2 10-6 m is bent into a complete circle. The resistance between diametrically opposite points will be
(2) 2.5
R = lA = 2 10-6 255 10-6 = 10
Each semicircle has resistance R2 = 5 , and the two are in parallel between diametrically opposite points.
Req = 5 55 + 5 = 2.5
Answer: (2)
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