At what points is the electric dipole field intensity parallel to the line joining the charges?

Define electric field intensity at a point.

Two point charges q_A = 3 muC and q_B = -3 muC are located 20 cm apart in vacuum. What is the electric field at the midpoint O of the line AB joining the two charges?

Define electric field intensity at a point. Give its S.I. units. Derive an expression for the electric field intensity at any point on the axial line of an electric dipole.

Define electric field and electric field intensity at a point.