An ion beam of specific charge $5 \times 10^7$ $coulomb/kg$ enter a uniform magnetic field of $4 \times 10^{-2}\, tesla$ with a velocity $2 \times 10^5\, m/s$ perpendicularly. The radius of the circular path of ions in meter will be
A$0.10$
B$0.16$
C$0.20$
D$0.25$
Medium
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A$0.10$
a Given $: \frac{e}{m}=5 \times 10^{7} \mathrm{C} / \mathrm{kg}$
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