An electric dipole of moment p ′ is placed in an electric field of intensity ’ E ’. The dipole acquires a position such that the axis of the dipole makes an angle θ with the direction of the field. Assuming that the potential energy of the dipole to be zero when = 90◦ , the torque and the potential energy of the dipole will respectively be: ?

An electric dipole of moment p ′ is placed in  an electric field of intensity ’ E ’. The dipole acquires a position such that the axis of the dipole makes an angle θ with  the direction of the field. Assuming that the potential energy of the dipole to be zero when = 90◦  , the torque and the potential energy of the dipole will respectively be: ?

(a) pE sin θ, −pE cos θ

(b) pE sin θ, −2pE cos θ

(c) pE sin θ, 2pE cos θ

(d) pE cos θ, −pE cos θ

Answer :  (a) pE sin θ, −pE cos θ