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NEET2013PhysicsElectrostaticsActual

An electric dipole of dipole moment p is aligned parallel to a uniform electric field E . The energy required to rotate the dipole by 90^ is:

Options

  1. Ap^2 E
  2. Bp E
  3. Cinfinity
  4. Dp E^3

Correct answer

B. p E

Step-by-step solution

Potential energy of dipole aligned & U=-p E & ( ₂- ₁ ) & Here ₂=0^ & =-p E & ( 90- ) & ₂=90^ & L U =P E & aligned

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