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

  • question_answer
    Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field \[\overrightarrow{B}={{B}_{0}}\widehat{k}\]

    A) They have equal z-components of momenta.

    B) They must have equal charges.

    C) They necessarily represent a particle-antiparticle pair.

    D) The charge to mass ratio satisfy:             \[{{\left( \frac{e}{m} \right)}_{1}}+{{\left( \frac{e}{m} \right)}_{2}}=0\]

    Correct Answer: D

    Solution :

    (d) The charge to mass ratio satisfy:                         \[{{\left( \frac{e}{m} \right)}_{1}}+{{\left( \frac{e}{m} \right)}_{2}}=0\] In the present situation the charge to mass ratio (elm) of these two particles is same and charges on them are of opposite character. Hence, the situation given in option (d) holds good.


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