Answer to Question #209264 in Physics for Yuko

Question

electric field at a point on the equatorial line of a small electric

dipole is 10N/C. What will be the electric field at a point situated at the

same distance on the axis of the dipole?

Answer 1

The field at a point on the equatorial line is

$$E_e=k\frac{2p}{r^3}.$$

The field on the axis:

$$E_a=k\frac {p}{r^3}.$$

Thus,

$$E_a=\frac{E_e}{2}=5\text{ N/C}.$$