The distance moved by a charged particle along the magnetic field (the component of velocity is parallel to the magnetic field) in one rotation is given by ($m$ - mass of the particle,$v$ - velocity of the particle,$q$ - charge of the particle,$B$ - magnetic field).

  • A
    $\frac{2 \pi m v}{q B}$
  • B
    $\frac{\pi mv}{qB}$
  • C
    $\frac{4 \pi mv}{qB}$
  • D
    $\frac{2 \pi m v}{q B^2}$

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