Very thin glass rod 4 meters long is rubbed all over with a silk cloth. it gains a uniformly distributed charge 1.7 ✕ 10−6 c. two small spherical rubber balloons of radius 1.2 cm are rubbed all over with wool. they each gain a uniformly distributed charge of -8 ✕ 10−8 c. the balloons are near the midpoint of the glass rod, with their centers 3 cm from the rod. the balloons are 2 cm apart (4.4 cm between centers). (a) find the net electric field at the location marked by the ✕, 0.6 cm to the right of the center of the left balloon. things to think about: which objects make nonzero contributions to vector e at this location