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NEET Sample Paper NEET Sample Test Paper-59

  • question_answer
    A molecule with dipole moment 'p' is placed in an electric field of strength E. Initially the dipole is aligned parallel to the field If the dipole is to be rotated to be antiparallel to the field, the work required to De done by an external agency is:

    A) ? 2pE                           

    B) ? pE    

    C) pE                               

    D) 2Pe

    Correct Answer: D

    Solution :

    [d] \[{{\theta }_{1}}=0\][Initially dipole sets parallel to electric field] \[{{\theta }_{2}}=180{}^\circ \] \[Work\,done\,=PE\,[cos{{\theta }_{1}}-Cos{{\theta }_{2}}]\] \[\,=PE\,[cos0{}^\circ -Cos180{}^\circ ]\] \[\,=PE\,[1-(-1)]\] \[W=2PE\]


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