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A wire of length 1m and radius 0.1 mm has a resistance of 100 Ω. Find the resistivity of thematerial. |
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Answer» 6.91 X 10^4Explanation:Factors of resistance - length and area which are DIRECTLY proportional to it then R = pl/A given, R = 100 ohm , length = 1m , Area of wire = area of cylinder then , p = R x A / l p = 100 x 2 pi 0.1 [ 0.1 + 1 } / 0.1 { : Area of cylinder = 2pi x r(RADIUS) [ r+l} } p = 6.91 x 10^4 |
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