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two points charges q and -q are separated by a distance 2l find the flux of electric field strength vector across the circle coinciding with the midpoint of line joining the two charges in the perpendicular plane
Asked by mahi905j | 22 Apr, 2022, 10:00: AM
Expert Answer
Figure shows the two charges +q and -q are separated by distance 2l .
Let a circle of radius R is passing through the mid point of line joining the charges at vertical plane.
Magnitude of electric field E+ at a point P which is at a distance r from centre of circle is given as
Direction of above electric field is along the line joing the point P and charge +q as shown in figure
Similarly magnitude of electric field E- at a point P which is at a distance r from centre of circle is given as
Direction of above electric field is along the line joing the point P and charge -q as shown in figure .
Resultant electric field E at a point P is given as
Let us consider an infintesimal area dA = r dr dΦ at point P ( polar coordinate system )
Flux Φ of electric field throug the circle is given as
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