Birds can safely stay on high voltage power lines without being electrically shocked. A 110kV power line has a cable diameter of 1.5 cm, and is made of copper with resistivity of 1.72x10^-8 Ωm.
a). What is the cross sectional area of the cable in m^2?
b). A bird has its feet spacing of 3 cm. Consider a short section of cable with the same length. What is the resistance of this section of cable?
c). The current flowing through the cable can be as high as 2000 A. What is the voltage across the short section of cable? Does that pose a life threat to the bird?