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NEET Sample Paper NEET Sample Test Paper-92

  • question_answer
    A uniform magnetic field acts at right angles to the direction of motion of electron. As a result, the electron moves in a circular path of radius 2 cm. If the speed of electron is doubled, then the radius of the circular path will be

    A) 2.0 on  

    B)        0.5cm

    C) 4.0 cm 

    D)        1.0cm

    Correct Answer: C

    Solution :

    [c] \[r=\frac{mv}{qB}\]or \[r\propto v\] As v is doubled, the radius also becomes double. Hence radius \[=2\times 2=4\,cm\]


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