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J & K CET Medical J & K - CET Medical Solved Paper-2000

  • question_answer
    A proton enters a magnetic field with velocity parallel to the magnetic field. The path followed by the proton is a :

    A)  circle                                    

    B)  parabola

    C)  helix                                    

    D)  straight line

    Correct Answer: D

    Solution :

                    When a proton enters a magnetic field, force acts on it, given by \[F=qvB=qv\times B\text{ }sin\theta \] Given, \[\theta =0\](parallel)\[\sin {{0}^{o}}=0\] \[\therefore \]  \[F=0\] Comparing with equation of straight line passing through origin.


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