the resistance of a metal wire of length 1 metre is 10 raise to the power 4 at 20 degree Celsius at the diameter of the wire is zero point 15 mm find the resistivity of the metal at the temperature
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we know from the extension of Ohm's law: R = ρl/A [R= 26Ω; l = 1m; diameter = 0.3mm, hence radius = 0.15mm, or, 0.15*10^(-3)m] putting this value in the relation, and finding ...
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