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**Help with resistance!!**

**1. 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.

**2. Homework Equations**

R = ( 1 / 2pi * sigma * length ) * ln (b/a)

sigma = conductivity of copper 58 Mega

**3. 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 cant figure out why the order is off. Does anyone see something I am missing?

Thanks