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Give reason : "If net flux assocaited with closec surface is zero, then net charge enclosed b that surface is zero." |
Answer» Solution :The LAW implies that the TOTAL electric flux through a closed surface is ZERO if no charge is enclosed by the surface.  The electric field is uniform and we an considering a closed cylindrical surface with it axis parallel to the uniform field `vecE`. `phi_(1)` and `phi_(2)` represent the flux through the surfaces 1 and 2 of the cylinder and `phi_(3)`is the flux through the curved cylindrical part of the closed surface.  Hence, `phi_(1) =-ES_(1) =-ES (therefore S_(1) =S)` `phi_(2) = ES_(2) = ES (therefore S_(2) =S)` where S is the AREA of circular cross-section. THUS, the total flux is zero, the total charge contained in the closed surface is zero. |
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