Two plastic bowling balls, 1 and 2 , are rubbed with cloth until they each carry a uniformly distributed charge of magnitude \(0.10 \mathrm{nC}\). Ball 1 is negatively charged, and ball 2 is positively charged. If the balls are held apart by a \(600-\mathrm{mm}\) stick stuck through the holes so that it runs from the center of one ball to the center of the other, what is the dipole moment of the arrangement?