Question

Let $E_a$ be the electric field due to a dipole in its axial plane distant $\ell$ and $E_q$ be the field in the equatorial plane distant $l^1$, then the relation between $E_a$ and $E_q$ will be :

• A. $E_a=4E_q$
• B. $E_q=2E_a$
• C. $E_a=2E_q$
• D. $E_q=3E_a$

Answer 1

The correct option is C $E_a=2E_q$

We know that for short dipole,
field at axial point, $E_a=\frac{2p}{d^3}$

and field at equatorial point, $E_q=\frac{p}{d^3}$

so $E_a=2E_q$