Question

An electric dipole of moment \(\mu = 400\,\mu C\,m\) is placed in a transverse electric field \(E = 50\,V/m\) at an angle of \(30^\circ\). Then a torque of

• A. \(10^{-2}\) Nm acts along the direction of \(\vec{E}\)
• B. \(10^{-3}\) Nm acts along the direction of \(\vec{\mu}\)
• C. \(10^{-5}\) Nm acts normal to both \(\vec{E}\) and \(\vec{\mu}\)
• D. \(10^{-3}\) Nm acts along the direction of \(\vec{E}\)
• E. \(10^{-2}\) Nm acts normal to both \(\vec{E}\) and \(\vec{\mu}\)

Hint:

Torque on dipole is maximum when perpendicular to field.

Answer 1

Answer: (E)