How the electric field due to an electric dipole is different from that of a point charge?

Asked by Topperlearning User | 16th Apr, 2015, 01:25: PM

Expert Answer:

1.     The electric field produced by a point charge at a point from the charge is given as


             that is the field will fall off as inverse square of the distance.
             whereas electric field due to dipole is given by

                                                            (at a point on the axis of the dipole)

                                                          (at a point on the equatorial plane)


             which means that electric field falls off not as 1/y2 but as 1/y3, so the electric field due to the dipole falls off much faster than the field due to a point charge.


2.      Also, the magnitude and the direction of the dipole field depend not only on the distance y but also on the angle between the position vector  and the dipole moment.

Answered by  | 16th Apr, 2015, 03:25: PM