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Force on electron from current-carrying wire

  • Thread starter dvdqnoc
  • Start date
  • #1
23
0

Homework Statement


http://img236.imageshack.us/img236/5369/physxn6.png [Broken]

Homework Equations


F = IL x B
F = QV x B


The Attempt at a Solution



Since I know I, L, Q, and V, I tried to work those into the two force equations... but I got no where. They dont give me B.
 
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Answers and Replies

  • #2
Shooting Star
Homework Helper
1,977
4
Since I know I, L, Q, and V, I tried to work those into the two force equations... but I got no where. They dont give me B.
Surely you can find B at a given distance from a long wire carrying a known current? Do you remember how the magnetic lines of force are around a straight wire?
 
  • #3
Nabeshin
Science Advisor
2,205
16
In getting the force you need to find the B-field first, either by applying the law of Biot-Savart or Ampere's law. Of course you could also have it memorized, but that just takes all the fun out of it.. :)
 

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