Q 1 :    

The electrostatic potential due to an electric dipole at a distance 'r' varies as                            [2024]

• $r$

   

• $\frac{1}{r^2}$

   

• $\frac{1}{r^3}$

   

• $\frac{1}{r}$

   

Q 2 :    

The distance between charges +q and −q is $2\lambda$ and between +2q and −2q is $4\lambda$. The electrostatic potential at point P at a distance $r$ from center O is $-\alpha \left[\frac{{\displaystyle ql}}{{\displaystyle r^2}}\right]\times {10}^9\text{V},$ where the value of $\alpha$ is _______ . (Use $\frac{1}{4\pi {\epsilon }_0}=9\times {10}^9{\text{ Nm}}^2{\text{C}}^{-2}$)              [2024]