Question

Two small conducting spheres of radius r and 2r have charges 40 c and 10 c respectively, placed at a distance r from each other experience a force of magnitude f1. If they are brought in contact and separated by same distance r, then they experience force of magnitude f2. The ratio of f1 to f2 is (r >> r)

Answer 1

Answer:

Your question is wrong as 1 body has radius r and 2nd body has radius 2r the initially when they placed apart from each other i.e. they are not in contact then minimum distance between the bodies is greater than 3r because the distance is measured from the center of the body.

So initially 'r' the distance between the bodies is not possible.