Aluminium wire has radius 0.25mm and length 75m.if the resistance of the wire is 10 ohm.calculate the resistivity of aluminum
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rho = R × A / L
rho = 10 × 3.14 × 0.25×0.25 ×10^-6 / 75
rho = 10 × 3.14 × 0.25×0.25 ×10^-6 / 75
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