Answer:
The electric flux through a given surface area is the total number of electric lines of force passing normally through that area. It is given by \[\Delta {{\phi }_{E}}=\vec{E}.\Delta \vec{S}=E\Delta S\cos \theta \] \[SI\] unit of electric flux\[=N{{M}^{2}}{{C}^{-1}}\] As the balloon is blown up and increases in size, the total charge on its surface remains constant. Hence, by Gauss's theorem, the total electric flux coming out of its surface remains unchanged.
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