Q 12-01-146JEE MainJEE Main 2019 (11 Jan, Shift 2)Easy
An electric field of $1000$ V/m is applied to an electric dipole at angle of $45^\circ$. The value of electric dipole moment is $10^{-29}$ C m. What is the potential energy of the electric dipole?
Answer: (B) $-7\times10^{-27}$ J
$$U = -pE\cos\theta = -10^{-29}\times1000\times\frac{1}{\sqrt2} \approx -7\times10^{-27}\ \text{J}$$
Solution by Sreeraj P, M.Sc Physics