Question

If $E_1$ be the electric field strength of a short dipole at a point on its axial line and $E_2$ that on the equatorial line at the same distance, then:

• A. $E_1=E_2$
• B. $E_1=2E_2$
• C. $E_2=2E_1$
• D. none of these

Answer 1

Answer: (B)

In end on position, the electric field strength is given by $E_1=\frac{1}{4\pi {\epsilon }_0}\times \frac{2p}{d^3}$ ?(i) Electric field strength on broad side on position or on equatorial position is $E_2=\frac{1}{4\pi {\epsilon }_0}\times \frac{p}{d^3}$ ?(ii) Now from equations (i) and (ii) $\frac{E_1}{E_2}=\frac{2}{1}$ or $E_1=2E_2$