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An accelerator produces a beam of protons with a circular cross section that is 1.9 mm...

An accelerator produces a beam of protons with a circular cross section that is 1.9 mm in diameter and has a current of 1.2 mA. The current density is uniformly distributed throughout the beam. The kinetic energy of each proton is 20 MeV. The beam strikes a metal target and is absorbed by the target.

(a) What is the number density of the protons in the beam?
__________  m-3

(b) How many protons strike the target in each minute?

_________
(c) What is the magnitude of the current density in this beam?
_________kA/m2

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