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What is the force on an electron traveling parallel to the wire

  1. Mar 11, 2009 #1
    1. Two parallel wires 0.200 m apart carry currents in opposite directions of 5.00 A. Find the
    magnetic field between the wires 0.0500 m from one of them and 0.150 m from the other.

    2. A long straight wire carries a current of 100. A.
    a. What is the force on an electron traveling parallel to the wire, in the opposite
    direction to the current, at a speed of 2.50x106 m/s when it is 0.100 m from the
    wire?

    Attempt: F=qvB

    b. Find the force on the electron under the above circumstances when it is traveling
    perpendicular to the wire.
    electronic charge 1.602x10-19 C
     
  2. jcsd
  3. Mar 11, 2009 #2

    LowlyPion

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    Re: Magnetism

    Just writing the Lorentz Force law isn't really an attempt.

    How would you think to approach it?
     
  4. Mar 11, 2009 #3
    Re: Magnetism

    for the first one, do we just get the magnetic field total? This is what i did.

    Btotal = B1 + B2
    B1 = MoI/2IIr ---> [(1.26X10^-6)(5)/(6.28)(15)
    B2 = MoI/2IIr ---> [(1.26x10^-6)(5)/(6.28)(0.05)

    Is that right?

    for the second one, I calculated magnetic field first. Then, used this equation:

    F=qvb
    Magnetic force faces the positive x direction, right? Im still kinda confused about the right hand rule

    b. Magnetic force faces in the negative y direction?

    please let me know if im wrong about anything. Thanks !
     
  5. Mar 11, 2009 #4

    LowlyPion

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