Tue December 13, 2011 By: Aishwarya Joshi

in ncert textbook for the derivation of electric field in the capacitors the formula for the electric field due to an infinitely charged plate is used instead of that due to a conductor. how is this right?

Expert Reply
Wed December 14, 2011
there is no contradiction.
in the text book the  net electric field in the region between the plates is ?/?0  (comes from adding the el fld due to each plate which are in same direction in the region between) , where as the el field due to each plate is ?/2?0.
in HCVerma, electric field in that region has been calculated from Gauss's law.
where total flux through the gaussian surface is taken ?A/?0.and "A" cuts from both sides . so the electric field at the region in betweenbecomes ?/?0 .
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