Physics · Electrostatic Potential

An electric dipole of moment \( \mathbf{p} \) is aligned at an angle \( \theta \) with a uniform electric field \( \mathbf{E} \). The work done by an external agent in turning the dipole from \( \theta_0 \) to \( \theta \) at infinitesimal angular speed is:

1. A
   \( pE(\cos\theta_0 - \cos\theta) \)
2. B
   \( -pE(\cos\theta_0 - \cos\theta) \)
3. C
   \( pE(\cos\theta + \cos\theta_0) \)
4. D
   \( pE(\sin\theta - \sin\theta_0) \)