What do you predict by the given statement about the nature of charge (positive or negative) enclosed by the closed surface. "In a closed surface, lines which are leaving the surface are double than the lines which are entering it".
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There is net positive charge in the close surface.
Sol. Since: φ φ out = 2 φ φ in
∴ φ φ net = φ φ out = + ve
i.e net flux is coming out (+ve) from the surface.
∴ There is net + ve charge inside closed surface
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