n is the number of particles and qe is the charge of an electron.
Speed, distance and time relationship:
t = d/v = (πD)/v
Where d is the distance covered going round the ring and D is the diameter of the ring.
The Stanford Linear Accelerator Center (SLAC) operated an electron storage ring about 72.0 m in diameter called SPEAR (closed in 2009), in which a circulating beam of electrons moved at nearly the speed of light.
Assuming that this electron beam had a current of 17 A, how many electrons were in the beam at any given moment?
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