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A Beam of Electrons Moves at Velocity

Question 55

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) ρv<sub>f</sub>A. C) 2ρv<sub>f</sub>A. D) ρv<sub>f</sub>(A+2πr ) . E) 2ρv<sub>f</sub>(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) ρv<sub>f</sub>A. C) 2ρv<sub>f</sub>A. D) ρv<sub>f</sub>(A+2πr ) . E) 2ρv<sub>f</sub>(A+πr ) .
Centered on the beam,the electron flux through the surface is


A) 0.
B) ρvfA.
C) 2ρvfA.
D) ρvf(A+2πr 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) ρv<sub>f</sub>A. C) 2ρv<sub>f</sub>A. D) ρv<sub>f</sub>(A+2πr ) . E) 2ρv<sub>f</sub>(A+πr ) . ) .
E) 2ρvf(A+πr 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) ρv<sub>f</sub>A. C) 2ρv<sub>f</sub>A. D) ρv<sub>f</sub>(A+2πr ) . E) 2ρv<sub>f</sub>(A+πr ) . ) .

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