40 \times 10^6$ revolutions/second
- Radius of the orbit, $r = 2.00$ cm $= 0.02$ m
- Charge of a proton, $q_p = 1.602 \times 10^{-19}$ C
- Mass of a proton, $m_p = 1.672 \times 10^{-27}$ kg
- Coulomb's constant, $k = 8.9875 \times 10^9$ N$\cdot$m$^2$/C$^2$
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