A Beam of Electrons Moves at Velocity

question 55

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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Definitions:

Economic Entity Assumption

This accounting principle assumes that a company's financial activities are distinct from those of its owners or other businesses.

Accounting Concept

Fundamental principles or theories that underpin financial accounting practices, such as the matching principle or accrual basis accounting.

Personal Loan

An unsecured loan given to an individual based on their creditworthiness, without requiring collateral, typically used for personal expenses.

Capital

Financial assets or the financial value of assets, such as cash and goods, used to fund a company or produce more wealth.