Four point charges, each of +q, are rigidly fixed at the four corners of a square planar soap film of side ${}^{\prime }{\alpha }^{\prime }$. The surface tension of the soap film is $\gamma$. The system of charges and planar film are in equilibrium, and $a=k{\left[\frac{q^2}{\gamma }\right]}^{1/N}$, where 'k' is a constant. Then N is

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