A "gold-leaf electroscope" is a device (shown below) that detects the presence of charge. The two leaves lift away from each other when they become charged. The electroscope is initially uncharged. A positively-charged conducting rod (not shown) is then brought near the electroscope. Explain (at the macroscopic level) why the leaves become charged when the rod is brought: (a) near to, but not in contact with, the cap of the electroscope. (b) in contact with the cap of the electroscope. In each case, specify which cause of charge transfer (conduction, friction or induction) best explains the action of the rod. metal cap T metal shaft gold leaf insulated box Time le