Q. Two identical conducting spheres are placed with their centers 0.40m apart. One is given a charge of 8 x10-9 C, other a charge of -18 10-9 C. Find the electrostatic force exerted on one sphere by the other.
Q. A 15.0{rm cm}-diameter non-conducting sphere carries a total charge of 2.25 mu {rm C}, distributed uniformly throughout its volume. Graph the electric field E as a function of the distance r from the center of sphere from r = 0 to r = 30.0{rm{ cm}}.