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Electric Dipoles in Electric Fields - Torque, Work and Energy

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Multiple Choice

An electric dipole of moment $ \vec { p } $ is placed in a uniform electric field$\vec { E }$ . Then
(i) The torque on the dipole is $\vec { p } \times \vec { E } $.
(ii) The potential energy of the system is $\vec { p } \cdot \vec { E } $.
(iii) The resultant force on the dipole is zero.
Choose the correct option.

  1. (i), (ii) and (iii) are correct
  2. (i) and (iii) are correct and (ii) is wrong
  3. Only (i) is wrong
  4. (i) and (ii) are correct and (iii) is wrong
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