What length of a copper wire 0.800-mm in a diameter has a resistance of 100 ohm's?
R = rho * L / pi r^2
So L = pi r^2 R / rho
r = 0.400 X 10^-3 m
R = 100 ohm
rho = to be noted in a data book
Plugging these known values we can compute the value of length in meter'
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