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.