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NEET Sample Paper NEET Sample Test Paper-92

  • question_answer
    An electron (mass \[=9\times {{10}^{-31}}kg,\] charge\[=1.6\times {{10}^{-19}}C\]) moving with a velocity of \[{{10}^{6}}m/s\]enters a magnetic field. If it describes a circle of radius 0.1m, then strength of magnetic field must be

    A) \[4.5\times {{10}^{-5}}T\]       

    B)        \[1.4\times {{10}^{-5}}T\]

    C) \[5.5\times {{10}^{-5}}T\]                   

    D) \[2.6\times {{10}^{-5}}T\]

    Correct Answer: C

    Solution :

    [c] \[Bqv=\frac{m{{v}^{2}}}{r}\] or \[B=\frac{mv}{rq}=\frac{(9\times {{10}^{-31}})\times {{10}^{6}}}{0.1\times (1.6\times {{10}^{-19}})}\]     \[=5.5\times {{10}^{-5}}T\]


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