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: mass of electron $m_e = 9 \times 10^{-31} \ kg$)
- 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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