calculate the resistance of km long copper wire of radius 1mm resistivity of copper is 1..72×10^-8
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length is 1 km
???
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its correct i think
oh yeah small calc mistake
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length=1 km= 1000 m
radius=1 mm= 10^(-3)
cross sectional area=pi*r^2
=3.14*10^(-6)
Resistivity=1.72x10^(-8)
so,
R=(1.72x10^(-8))(10^3)/(3.14x10^(-6)
R=1.72x10/3.14=1720/314=5.478 ohms
PLZ MARK IT AS BRAINLIEST..
radius=1 mm= 10^(-3)
cross sectional area=pi*r^2
=3.14*10^(-6)
Resistivity=1.72x10^(-8)
so,
R=(1.72x10^(-8))(10^3)/(3.14x10^(-6)
R=1.72x10/3.14=1720/314=5.478 ohms
PLZ MARK IT AS BRAINLIEST..
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