A Beam of Electrons Moves at Velocity

question 47

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) ρv_fA.
• C) 2ρv_fA.
• D) ρv_f(A+2πr ).
• E) 2ρv_f(A+πr ).

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