The resistance of a pieces of wire of length 20m are crossed-sectional area 8 x 10 -6m2is? [Resistivity of the wire = 4 x 10-7 Ω m]
since resistance R = p (l)/a = (4 x 10-7 x 20)/8.0 x 10-6 R = 1.0 Ω
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