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NEET Sample Paper NEET Sample Test Paper-55

  • question_answer
    An electric dipole of length 1 cm is placed with the axis making an angle of \[30{}^\circ \] to an electric field of strength\[{{10}^{4}}\,N{{C}^{-}}^{1}\]. If it experiences a torque of \[10\sqrt{2}\,\,Nm\], the potential energy of the dipole is-

    A) 0.245 J

    B)   \[\,2.45\,\times \,{{10}^{-}}^{4}\,J\]

    C) 0.0245 J                       

    D) 245.0 J

    Correct Answer: D

    Solution :

    \[\tau =\,\,pE\text{ }sin\,\theta \] \[U\,\,=\,\,pE\text{ }cos\,\,\theta \] \[\frac{\tau }{U}\,\,=\,\,tan\,\theta \]


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