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NEET Sample Paper NEET Sample Test Paper-78

  • question_answer
    If a solenoid of magnetic moment \[0.2\,A{{m}^{2}}\] in a uniform magnetic field 0.16 T experiences a torque 0.016 Nm, then angle made by a solenoid axis with magnetic field is

    A)  \[30{}^\circ \]                         

    B)  \[45{}^\circ \]

    C)  \[60{}^\circ \]                         

    D)  \[90{}^\circ \]

    Correct Answer: A

    Solution :

    \[\tau =M\times B\] \[\left| \,\tau \, \right|\,\,=\,\,\left| M \right|\,\,\left| B \right| sin \theta \] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,0.016= 0.2\times  0.16 \times  sin \theta \] \[\sin \,\theta \,\,=\,\,\frac{1}{2}\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\theta =30{}^\circ \]


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