What is the value of the angle between the vectors, p, and E for which

1.	What is the value of the angle between the vectors, p, and E for which the potential energy of an electric dipole of dipole moment p, kept in an external electric field E, has the maximum value.
Answer» P.E = -p . E = -pE cos\(\theta\) \(\therefore\) P.E. is the maximum when cos\(\theta\) = -1, i.e \(\theta\) = \(\pi\)(180°)

What is the value of the angle between the vectors, p, and E for which the potential energy of an electric dipole of dipole moment p, kept in an external electric field E, has the maximum value.

Answer»

P.E = -p . E = -pE cos\(\theta\)

\(\therefore\) P.E. is the maximum when cos\(\theta\) = -1, i.e

\(\theta\) = \(\pi\)(180°)