An electron beam travels with a velocity of $1.6 \times 10^7 \ m/s$ perpendicularly to a magnetic field of intensity $0.1 \ T$. Calculate the radius of the path of the electron beam. (Given: $m_e = 9 \times 10^{-31} \ kg$,$e = 1.6 \times 10^{-19} \ C$)

  • A
    $9 \times 10^{-5} \ m$
  • B
    $9 \times 10^{-2} \ m$
  • C
    $9 \times 10^{-4} \ m$
  • D
    $9 \times 10^{-3} \ m$

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