39if u look at this:
http://en.wikipedia.org/wiki/Rotational_symmetry
i guess u would get a fair idea of what is meant by cylindrical symmtry and why is he using the term here
why does field of electric dipole have a cylindrical symmetry.also explain w.r.t eqn of field on equatorial axis kp/[(r2+a2]3/2.
what does this statement then mean:because of the cylindrical symmetry for the two charge system, at all points in a vertical plane containing the dipole vector, the electric field lies in that plane.
what does this mean:Directly above and below the dipole, along the dipole axis, the field is vertically upwards whereas in the equatorial plane, the field is vertically downwards.
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