Find the electric flux (in S.I. unit) through the rectangular plate abed of length l = 2 m, width L and whose center is at a distance 
from an infinite line of charge with linear charge density 
. Consider that the plane of the frame is perpendicular to line OP.
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If we arrange three more rectangular plates (similar to the one which is given) around the wire, then we get a rectangular box open at both ends. We bring two more plates and use them to close this rectangular box. We can see from the figure that we have a symmetric system for which the total flux is
Hence the flux through one plate is
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