two metal spheres connected by a metal rod stand on plastic supports. initially the spheres and metal rod do not hold any charge. a charged plastic rod with q (q>0) is placed near the sphere on the right without touching it. then, the metal rod connecting the spheres is removed. finally, the initially charged plastic rod is taken away. at this point: a. spheres attract one another b. spheres repel one another c. spheres do not exert a force on one another d. not enough information