A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to ?

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to ?

(a) \( p^{-T} \) and \( r^{-2} \)

(b) \( p \) and \( r^{-2} \)

(c) \( p^2 \) and \( r^{-3} \)

(d) \( p \) and \( r^{-3} \)

Answer :  (d) \( p \) and \( r^{-3} \)

\( \ell \ll r \)

\( E_{\text{eq}} = k \frac{P}{r^3} \)