Question

An electric dipole of moment $\overrightarrow {p}$ is placed in a uniform electric field $\overrightarrow {E}$. Then (i) the torque on the dipole is $p \times E$ (ii) the potential energy of the system is $\overrightarrow{p}$.$\overrightarrow{E}$ (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

Answer 1

Answer: (B)

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

Answer 2

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