(a) Which physical quantity has its SI unit (1) Cm (2) N/C.
(b) Two point charges q and -q is placed at a distance $$2a$$ apart. Calculate the electric field at a point P is situated at a distance r along the perpendicular bisector of the line joining the charges. What is the electric field when r >> a? Also, give the direction of electric field w.r.t. electric dipole moment?