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A Beam of Electrons Moves at Velocity

question 69

Multiple Choice

A beam of electrons moves at velocity 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) ρvf A. C) 2ρvf A. D) ρvf (A+2πr ) . E) 2ρvf (A+πr ) . . 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 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) ρvf A. C) 2ρvf A. D) ρvf (A+2πr ) . E) 2ρvf (A+πr ) . centered on the beam, the electron flux through the surface is

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