$A$ charged particle is moving in a circular orbit of radius $6 \, cm$ with a uniform speed of $3 \times 10^6 \, m/s$ under the action of a uniform magnetic field $2 \times 10^{-4} \, Wb/m^2$ which is at right angles to the plane of the orbit. The charge to mass ratio of the particle is

  • A
    $5 \times 10^9 \, C/kg$
  • B
    $2.5 \times 10^{11} \, C/kg$
  • C
    $5 \times 10^{11} \, C/kg$
  • D
    $5 \times 10^{12} \, C/kg$

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