Abird lands on a bare copper wire carrying a current of 51 a. the wire is 8 gauge, which means that its cross-sectional area is 0.13 cm2. (a) find the difference in potential between the bird's feet, assuming they are separated by a distance of 5.1 cm.

The resistance of the piece of wire is

where
is the resistivity of the copper
is the length of the piece of wire
is the cross sectional area of the wire
By substituting these values, we find the value of R:


Then, by using Ohm's law, we find the potential difference between the two points of the wire: