Multiple Choice
A beam of electrons moves at velocity 
) The number of particles per unit volume in the beam of area A is ρ.If we imagine a cylindrical Gaussian surface of radius r and length 
Centered on the beam,the electron flux through the surface is
A) 0.
B) ρvfA.
C) 2ρvfA.
D) ρvf(A+2πr 
) .
E) 2ρvf(A+πr 
) .
Correct Answer:
Verified
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