The resistivity of wire is 0. 46×10^-6 ohmmeter. You required to construct a coil of resistance 10ohm using a wire of diameter of 0. 44mm. What is the length of wire that you will take for this purpose
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L=RA/0.46×10^-6
=[10×(0.22×10^-3)^2×π]/[0.46×10^-6]
=3.3 m
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