12th Class Physics Magnetism Question Bank Assertion And Reason (MCQs) - Moving Charges and Magnetism

  • question_answer
    Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as: Assertion [A]: An electron and proton enters a magnetic field with equal velocities, then, the force experienced by proton will be more than electron. Reason (R): The mass of proton is 1999 times more than the mass of electron.

    A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]

    B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]

    C) Assertion [A] is true but Reason (R) is false

    D) Assertion [A] is false and Reason (R) is also false

    Correct Answer: D

    Solution :

    [d] The force experienced by a charge particle in a magnetic field is given by,                         \[\overrightarrow{F}=q(\overrightarrow{v}\times \overrightarrow{B})\] which is independent of mass. As q, v and B are same for both the electron and proton, hence both will experience same force.


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