At the end of class today, I showed a photo of humans on a live power line. It is indeed possible to inspect power lines without switching off the power to our homes as long as the inspection crew gets dropped off via helicopter! (See previous homework question why the crew has to be dropped off with a helicopter. . . ) Consider crouching on a power hue touching two points one meter apart. Estimate the potential difference between those points, given that a typical power line cable is made out of aluminjmn, about 4 cm in diameter, and carries a current of the order of 100 A. Estimate the current that would run through you. (Hint: look up the resistivity of aluminium in the textbook.) Would you trust your calculation enough to do this in real life