$A$ particle having a charge $50 \ e$ is revolving in a circular path of radius $0.4 \ m$ with $1 \ r.p.s.$ The magnetic field produced at the centre of the circle is $(\mu_0 = 4 \pi \times 10^{-7} \ SI \ units$ and $e = 1.6 \times 10^{-19} \ C)$.
- A$10^{-7} \mu_0$
- B$10^{-10} \mu_0$
- C$10^{-14} \mu_0$
- D$10^{-17} \mu_0$
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