Physics · Electrostatic Potential

An electric dipole of dipole moment \( p \) is placed in a uniform electric field \( \mathbf{E} \). If the dipole is rotated from an angle \( \theta = 0^\circ \) to \( \theta = 180^\circ \), the work done by the external agent is:

1. A
   \( pE \)
2. B
   Zero
3. C
   \( -2pE \)
4. D
   \( 2pE \)