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JEE Main & Advanced JEE Main Paper (Held on 7 May 2012)

  • question_answer
    The velocity of certain ions that pass undeflected through crossed electric field E = 7.7 k V/m and magnetic field B = 0.14T is   JEE Main Online Paper (Held On 07 May 2012)

    A) 18km/s                

    B)                        77km/s

    C)                        55km/s.               

    D)                        1078 km/s

    Correct Answer: C

    Solution :

    .               As velocity\[v=\frac{E}{B}=\frac{7.7\times {{10}^{3}}}{0.14}=55km/s\]


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