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NEET Sample Paper NEET Sample Test Paper-85

  • question_answer
    A current of I ampere flows in a wire forming a circular arc of radius r metres subtending an angle \[\theta \]at the centre as shown. The magnetic field at the centre O in tesla is

    A) \[\frac{{{\mu }_{0}}I\theta }{4\pi r}\]    

    B)        \[\frac{{{\mu }_{0}}\,I\theta }{2\pi r}\]

    C) \[\frac{{{\mu }_{0}}\,I\theta }{2r}\]       

    D)        \[\frac{{{\mu }_{0}}\,I\theta }{4r}\]

    Correct Answer: A

    Solution :

    [a] \[B=\frac{{{\mu }_{0}}I}{2r}\times \frac{\theta }{2\pi }=\frac{{{\mu }_{0}}I\theta }{4\pi r}\]


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