Question

An electric dipole with dipole moment $4\times 10^{-9}Cm$ is aligned at $30^{\circ }$ with the direction of a uniform electric field of magnitude $5\times 10^{4}N{C}^{-1}$, the magnitude of the torque acting on the dipole is

• A. $10^{-5}Nm$
• B. $10\times 10^{-3}Nm$
• C. $10^{-4}Nm$
• D. $\sqrt{3}\times 10^{-4}Nm$

Answer 1

Answer: (C)

$\tau =$ P.E. $\sin \theta$