Force on electron from current-carrying wire

AI Thread Summary
To determine the force on an electron from a current-carrying wire, the magnetic field (B) must first be calculated using the Biot-Savart law or Ampere's law. The relevant force equations, F = IL x B and F = QV x B, require knowledge of the magnetic field to solve for the force. The discussion highlights the challenge of not having B provided directly in the problem. Understanding the magnetic field around a straight wire is crucial for solving the problem effectively. Calculating B is essential before applying the force equations to find the desired result.
dvdqnoc
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Homework Statement


http://img236.imageshack.us/img236/5369/physxn6.png

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 don't give me B.
 
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dvdqnoc said:
Since I know I, L, Q, and V, I tried to work those into the two force equations... but I got no where. They don't 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?
 
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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