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Mar 2, 2021 at 2:21 vote accept Chatrapal Singh Rathore
Mar 1, 2021 at 17:59 comment added Bob D @ChatrapalSinghRathore Yes, if I understand you correctly. For surfaces S3 and S4 all the lines (and thus flux) that go into the volume enclosed by the surface must exit the volume enclosed by the closed surface as well, for a net flux of zero. For S1 and S2 all the line leave the volume or enter the volume, respectively, for a net flux in each case. A positive net flux for S1 (indicating a net positive charge enclosed) and negative flux for S2 (indicating a net negative charge enclosed)
Mar 1, 2021 at 17:15 comment added Chatrapal Singh Rathore I was visualising the electric field lines to be 2-D. So I was there? That would mean that the field lines move out of the page from positive pole and then into the page towards the negative pole?
Mar 1, 2021 at 13:14 history answered Bob D CC BY-SA 4.0