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Two identical metallic spheres are charged with 10 and -20 units of charge. If both the spheres are first brought into contact with each other and then are placed to their previous positions, then the ratio of the force in the two situations will be?
Asked by 420kaul | 11 Apr, 2020, 05:30: PM
potential energy of charged metallic sphere is proportional to charge on its surface.

If two identical metallic spheres are having charge 10 and -20 units , then their potetial will be 10k and -20k where k is constant.

When these two sphere are made to touch each other, they will be at constant potential -5k

After separation each sphere will have charge -5 units

Initial Force between charges 10 × (-20) = -200k1 , where k1 is constant

Force after making them in contact and separating after = (-5) × (-5) = 25 k1

Hence ratio of forces between two sitiation = -200k1 / 25k1 = -8 : 1
Answered by Thiyagarajan K | 11 Apr, 2020, 07:03: PM

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