2. Solved Papers
  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2011

  • question_answer
    A dipole of electric dipole moment p is placed in a uniform electric field of strength E. If \[\theta \] is the angle between positive directions of p and E, then the potential energy of the electric dipole is largest when \[\theta \] is

    A)  \[\frac{\pi }{4}\]                             

    B)         \[\frac{\pi }{2}\]                             

    C)  \[\pi \]                

    D)         zero     

    E)  \[\frac{2}{3}\pi \]

    Correct Answer: C

    Solution :

    Dipole energy \[U=-pE\,\cos \theta \] When U is maximum                 \[\cos \theta =-1\]                 \[\theta =\pi \]


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