Two electric dipoles, A, B with respective dipole moments d_A =-4 qa i and d_B =-2 qa i are placed on the x -axis with a separation R, as shown in…

Two electric dipoles, A, B with respective dipole moments $\displaystyle \overrightarrow{\mathrm{d}_{\mathrm{A}}}=-4$ qa $\displaystyle \hat{i}$ and $$\overrightarrow{\mathrm{d}_{\mathrm{B}}}=-2 \text { qa } \hat{i} \text { are placed on the } x \text {-axis with } $$ a separation R, as shown in the figure The distance from $\displaystyle A$ at which both of them produce the same potential is :