Formula to find the number of protons in a cylindrical proton beam hitting a target in 1 second. Given only the area of the cross section.
Also the formula to find the electron density in a cylindrical electron beam.
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Explanation:
When one coulomb charge passes through any cross section of the wire per second,the current passing is one ampere. Charge of electron ,e=1.6X10^-19C. n=1/(1.6X10^-19)=6.25X10^18. This number of electrons passes through cross section of a wire carrying 1A current.
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