Question:
An electric dipole of moment $\vec{p}=(\hat{i}-3 \hat{j}+2 \hat{k}) \times 10^{-29}$ C.m is at the origin $(0,0,0)$. The electric field due to this dipole at $\vec{r}=+\hat{i}+3 \hat{j}+5 \hat{k}$
(note that $\vec{r} \cdot \vec{p}=0$ ) is parallel to:
Correct Option: , 3
Solution:
(3) Since $\vec{r} \cdot \vec{p}=0$
$\vec{E}$ must be antiparallel to $\vec{p}$
$\therefore \hat{E}$ is parallel to $(\hat{i}+3 \hat{j}-2 \hat{k})$