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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2013

  • question_answer
        A proton travelling at\[23{}^\circ C\]w.r.t. the direction of a magnetic field of strength 2.6 mT experiences a magnetic force of\[6.5\times {{10}^{-17}}N\]. What is the speed of the proton?

    A)  \[2\times {{10}^{5}}\text{ }m/s\]            

    B)  \[4\times {{10}^{5}}\text{ }m/s\]

    C)  \[6\times {{10}^{5}}\text{ }m/s\]            

    D)  \[6\times {{10}^{-5}}\text{ }m/s\]

    Correct Answer: B

    Solution :

                    \[F=qvB\sin \theta \] \[v=\frac{F}{qB\sin \theta }\] \[=\frac{6.5\times {{10}^{-17}}}{26\times {{10}^{-3}}\times 1.6\times {{10}^{-19}}\times 0.39}\] \[v=4\times {{10}^{5}}m/s\]      


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