SLIDE 1
a K passes through a uniform magnetic field . Only the B ext - - PowerPoint PPT Presentation
a K passes through a uniform magnetic field . Only the B ext - - PowerPoint PPT Presentation
A "ribbon" (width ) with uniform surface current density a K passes through a uniform magnetic field . Only the B ext length along the ribbon is in the field. What is the b magnitude of the force on the ribbon? A. KB B. aKB C.
SLIDE 2
SLIDE 3
To find the magnetic field at P due to a current-carrying wire we use the Biot-Savart law, What is the direction of the infinitesimal contribution created by current in ?
B B(r) = I ∫ μ0 4π dl × ℜ ̂ ℜ2 B(P) dl
- A. Up the page
- B. Directly away from
(in the plane of the page)
- C. Into the page
- D. Out of the page
- E. Some other direction
dl
SLIDE 4
What is the magnitude of ?
dl × ℜ ̂ ℜ2
A. B. C. D.
- E. something else!
dl sin θ ℜ2 dl sin θ ℜ3 dl cos θ ℜ2 dl cos θ ℜ3
SLIDE 5
What is the value of ?
I dl × ℜ ̂ ℜ2
A. B. C. D.
- E. Other!
I y dx′ [( + x′)2 y2]3/2 ẑ I d x′ x′ [( + x′)2 y2]3/2 ŷ −I d x′ x′ [( + x′)2 y2]3/2 ŷ −I y dx′ [( + x′)2 y2]3/2 ẑ
SLIDE 6
What do you expect for direction of ? How about direction of generated JUST by the segment of current in red?
B(P) dB(P) dl
A. in plane of page, ditto for , by red B. into page, , by red into page C. into page, , by red out of page D. complicated, ditto for , by red
- E. Something else!!