Question

what is the value of the angle and between the vector P and E for which the potential energy of an electric dipole of dipole moment P kept in an external electric field E vector has maximum value

Answer 1

Hi friend,

The formula for the potential energy of an electric dipole of dipole moment is

U= -PE cos (theta)

Where,

U= Work done
P= dipole moment
E=electric field.

The maximum work obtainable at the angle of 0° .

:-U=-PE

If the angle is 90° there occurs a minimum work done.

U= 0.

Note:-
( The negative sign indicates that the work done against the direction of dipole moment).

Hope this helped you a little!!!

Answer 2

cos 90° is the answer ....