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An accelerator produces a beam of protons with a circular cross section that is 2.0 mm in diameter and has a current of1.1 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?
Answer: ______ m^-3
(b) How many protons strike the target in each minute?
Answer: ______
(c) What is the magnitude of the current density in this beam?
Answer: ______ kA/m^2
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