The resistance of a metal wire of length one metre is 25 ohm at 20 degree Celsius if the diameter of the wire is 0.3 mm . what must be the resistivity of metal at that temperature
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Explanation:
R = 25 ohm,
L = 1 m,
D = 0.3 mm = 3 x 10-4 m
radius r = D/2 = 1.5 x 10-4 m
A = = (1.5 x 10-4)(1.5 x 10-4 ) = * 2.25 x 10-8 m2
resistivity = R X A / L = 25 x * 2.25 x 10-8 / 1
resistivity = 1.76 x 10-6 ohm-m
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