A plastic rod is rubbed with wool, producing a distribution of positive and negative surplus charge that is concentrated in two locations on the rod and two on the wool. This distribution can be approximated as two pairs of small balls of charge as shown in Figure P26.5. The distance \(d\) is \(30.0 \mathrm{~mm}\), and the magnitude of the charge on each ball is \(2.00 \mu \mathrm{C}\). If \(34.0 \mathrm{~J}\) of work went into thermal energy as the rod and wool heated up, how much work was done on the system?

Data from Figure P26.5

0 rod -2d- -2d- wool d