A proton (mass $m$ and charge $+e$) and an $\alpha - $particle (mass $4m$ and charge $+2e$) are projected with the same kinetic energy at right angles to the uniform magnetic field. Which one of the following statements will be true

  • A

    The $\alpha - $ particle will be bent in a circular path with a small radius that for the proton

  • B

    The radius of the path of the $\alpha - $ particle will be greater than that of the proton

  • C

    The $\alpha - $ particle and the proton will be bent in a circular path with the same radius

  • D

    The $\alpha - $ particle and the proton will go through the field in a straight line

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