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 
. The system of charges and planar film are in equilibrium, and a = k, 
where ‘k’ is a constant. Then N is
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
Surface Tension 
= 
= 
× 
× 2
a = (Some constant) 
So, N = 3
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