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Hi! we did a lab where we charged a big sphere with 5kV, with this sphere we then charged another smaller sphere that was hanging loose from a string by touching it. We had to measure the distance the small sphere moved from its initial position and also the distance from the big sphere to the final position of the small sphere. We did this about 5-6 times, and my task is to find the relationship between force and separation. i read that the force is proportional to square inverse of the seperation. how would i show this on a graph? the seperation is the distance from the initial to the final position of the small sphere? and what is the force? the 5kV? or what? help needed thanks