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CMC Medical CMC-Medical VELLORE Solved Paper-2010

  • question_answer
    An electric field of 1500 V/m and a magnetic field of 0.40 Wb/m2 act on a mm electron. The minimum uniform speed along a straight line, the electron could have is

    A)  \[1.6\times {{10}^{15}}\]m/s   

    B)  \[6\times {{10}^{-6}}\]m/s

    C)  \[3.75\times {{10}^{3}}\]m/s   

    D)  \[3.75\times {{10}^{2}}\]m/s

    E)  None of these

    Correct Answer: C

    Solution :

                    When electron moves in both electric and magnetic fields then, \[qE=qvB\] \[v=\frac{E}{B}=\frac{1500}{0.40}\] \[=3750\,\,m\text{/}s\]                 \[v=3.75\times {{10}^{3}}m\text{/}s\]


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