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12th Class Physics Magnetism Question Bank MCQ - Moving Charges and Magnetism

  • question_answer
    What uniform magnetic field applied perpendicular to a beam of electrons moving at\[1.3\times {{10}^{6}}\text{ }m{{s}^{-1}}\], is required to make the electrons travel in a circular are of radius 0.35 m?

    A) \[2.1\times {{10}^{-5}}G\]                   

    B) \[6\times {{10}^{-5}}T\]

    C) \[2.1\times {{10}^{-5}}T\]                   

    D) \[6\times {{10}^{-5}}G\]

    Correct Answer: C

    Solution :

    (c) \[2.1\times {{10}^{-5}}T\] Radius,   \[r=\frac{mv}{qB}\] or \[\frac{mv}{qr}\]             \[=\frac{9.1\times {{10}^{-31}}\times 1.3\times {{10}^{6}}}{1.6\times {{10}^{-19}}\times 0.35}\]             \[=2.1\times {{10}^{-5}}T\]


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