An electric dipole of moment p is placed in a uniform electric field E. Then (i) the torque on the dipole is p × E (ii) the potential energy of the system is p.E (iii) the resultant force on the dipole is zero.

Question

An electric dipole of moment p is placed in a uniform electric field E. Then (i) the torque on the dipole is p × E (ii) the potential energy of the system is p.E (iii) the resultant force on the dipole is zero. (A) (i), (ii) and (iii) are correct (B) (i) and (iii) are correct and (ii) is wrong (C) Only (i) is correct (D) (i) and (ii) are correct and (iii) is wrong

Tardigrade Admin · Accepted Answer

The torque acting on a dipole is given by τ = p × E, the potential energy of the dipoie is given by U = - p. E and the resuitant force on the dipole is zero.

Q. An electric dipole of moment $p$ is placed in a uniform electric field $E$ . Then
(i) the torque on the dipole is $p \times E$
(ii) the potential energy of the system is $p$ . $E$
(iii) the resultant force on the dipole is zero.

(i), (ii) and (iii) are correct

(i) and (iii) are correct and (ii) is wrong

Only (i) is correct

(i) and (ii) are correct and (iii) is wrong

(i), (ii) and (iii) are wrong.

The torque acting on a dipole is given by $τ$ = p $\times$ E, the potential energy of the dipoie is given by $U$ = - p. E and the resuitant force on the dipole is zero.

Q. An electric dipole of moment p​ is placed in a uniform electric field E. Then (i) the torque on the dipole is p×E (ii) the potential energy of the system is p​.E (iii) the resultant force on the dipole is zero.