A copper wire has resistivity 1.6 ×10^-8ohm meter gas a cross section area of 10×10^-4 cm^2. Calvulate yhe length of the wire required to make 20ohm coil
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Resistance=resistivity*length/area
length=resistance*area/resistivity
length=200*10*10^-4/1.6*10^-8
length=125*10^5m
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