- #1
FatoonsBaby71
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Help with resistance!
Determine the resistance of a copper conductor 2m long with a circular cross section and a radius of 1mm at one end increasing linearly to a radius of 5mm at the other.
R = ( 1 / 2pi * sigma * length ) * ln (b/a)
sigma = conductivity of copper 58 Mega
Well the correct answer is 2.20mOHms
I use the equation above and I get 2.20 * 10^-9. I can't figure out why the order is off. Does anyone see something I am missing?
Thanks
Homework Statement
Determine the resistance of a copper conductor 2m long with a circular cross section and a radius of 1mm at one end increasing linearly to a radius of 5mm at the other.
Homework Equations
R = ( 1 / 2pi * sigma * length ) * ln (b/a)
sigma = conductivity of copper 58 Mega
The Attempt at a Solution
Well the correct answer is 2.20mOHms
I use the equation above and I get 2.20 * 10^-9. I can't figure out why the order is off. Does anyone see something I am missing?
Thanks