question_answer

Electric field strength due to a dipole at a point on the axial line of dipole is :

A)  from positive charge to negative charge

B)  from negative charge to positive charge

C)  along the equatorial line

D)  at an angle to axial line

Correct Answer: C

Solution :

                 For a dipole having two charges + q and ? q separated at a distance 21, the intensity of electric field at an axial point P is given by \[E=\frac{1}{4\pi {{\varepsilon }_{0}}}=\frac{2p}{{{r}^{3}}}\]where p is dipole moment. The direction of electric field E is along the axis of the dipole from negative charge towards positive charge.