# Question #0a80a

##### 1 Answer

Nov 29, 2016

#### Answer:

#### Explanation:

The resistance, R, of a wire resistor (in Ohms) is:

where

Solve equation [1] for L:

I believe that there is a minor error the unit for resistivity should be

We are given:

Convert the diameter to a a radius (in meters)

The cross-sectional area is that of a circle:

Substitute into equation [2]:

Please notice how the unit cancel, leaving only meters: