Identical isolated conducting spheres 1 and 2 have equal charges and are separated by a distance that is large compared with their diameters [see Figure (0}). The magnitude of the electrostatic force acting on sphere 2 due to sphere 1 is F = 4.7 N. Suppose now that a third identical sphere 3. having an insulating handle and initially neutral, is touched rst to sphere 1(see Figure {bl}, then to sphere 2 {see Figure (c)), and nally removed {see Figure ((2')). What is the magnitude ofthe electrostatic force F' that now acts on sphere 2? 30 63 3 e (a) (b) .4 a If! 03 oev (r) (d)