Understanding Electric Currents and Charge Continuity
Explore the concepts of electric currents, charge continuity, volume current density, surface current density, and more through a series of questions and visuals. From understanding the flow of ions in a liquid to calculating current densities in wires, this content delves into essential principles in electromagnetism.
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5.5 Positive ions flow right through a liquid, negative ions flow left. The spatial density and speed of both ions types are identical. Is there a net current through the liquid? A)Yes, to the right B) Yes, to the left C) No D) Not enough information given
5.7 Current I flows down a wire (length L) with a square cross section (side a) If it is uniformly distributed over the entire wire area, what is the magnitude of the volume current density J? A) B) J = I/a2 J =I /4a J = I/a J =a2I C) D) E) None of the above !
Current I flows down a wire (length L) with a square cross section (side a) If it is uniformly distributed over the outer surfaces only, what is the magnitude of the surface current density K? 5.6 A) B) K = I/a2 K = I/(4a) K = I/a K =aI C) D) E) None of the above
A "ribbon" (width a) of surface current flows (with surface current density K) Right next to it is a second identical ribbon of current. Viewed collectively, what is the new total surface current density? 5.8 K a
A "ribbon" (width a) of surface current flows (with surface current density K) Right next to it is a second identical ribbon of current. Viewed collectively, what is the new total surface current density? 5.8 A) K B) 2K C) K/2 D) Something else a
A "ribbon" (width a) with uniform surface current density K passes through a uniform magnetic field Bext. Only the length b along the ribbon is in the field. What is the magnitude of the force on the ribbon? ERK5-1 A) KB Bext B) aKB a C) abKB K D) bKB/a b E) KB/(ab)
Which of the following is a statement 5.10 Charge Conservation of charge conservation? r t =
Which of the following is a statement 5.10 Charge Conservation of charge conservation? r t r t r t = - J dA =- J A) B) r t = - ( J) dt C) = - J D) E) Not sure
Which of the following is a statement 5.10 Charge Conservation of charge conservation? r t r t = - J =- J A) B) r t r t =- J dA =- ( J) dt C) D) E) Not sure
