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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    An electron is moving in a circle of radius r in a uniform magnetic field B. Suddenly, the field is reduced to B/2. The radius of the circle now becames

    A)  \[\frac{r}{2}\]                                  

    B)  \[\frac{r}{4}\]

    C)  \[2r\]                                   

    D)  \[4r\]

    Correct Answer: C

    Solution :

                    \[r=\frac{mv}{qB}\] \[r\propto \frac{I}{B}\] So, as B became \[\frac{B}{2},\] r becames 2r,


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