JEE Advanced 2011 Physics question
Four point charges, each of +q, are rigidly fixed at the four corners of a square planar soap film of side 'a'. The surface tension of the soap film is γ. The system of charges and planar film are in equilibrium, and , where 'k' is a constant. Then N is
Answer: 3
Solution
Each charge is pushed outward by the Coulomb repulsion of the other three charges, of magnitude , and pulled inward by the surface tension of the film along its edges, (force
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