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Force exerted by a current carrying wire

  1. Mar 4, 2013 #1
    1. The problem statement, all variables and given/known data
    A long thing wire carries a current of 2.0A.
    An electron of charge -1.6x10^-19 moves parallel to the wire at a distance, d of 0.01m
    The electron velocity is 100km/s.

    State the magnitude & direction of the force acting on the electron.

    2. Relevant equations
    Hmmm! Not really sure about this. Should I use Coulombs Law? Momentum. Newton's 2nd F=dp/dt
    q1 q2 / 4∏εr2 rhat

    Certainly Right hand rule.

    3. The attempt at a solution
    Last edited: Mar 4, 2013
  2. jcsd
  3. Mar 4, 2013 #2


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    Staff: Mentor

    The wire is not charged, Coulomb's law is not relevant.

    Hint: The force comes from the magnetic field.
  4. Mar 4, 2013 #3
    Well direction magnetic field of wire is found by the"right hand rule";
    grab wire with thumb pointing in direction of current & mag field goes in direction of curl of fingers around the wire.
    Then force is mutually perpendicular to v & B as I understand.

    Good start I think. Yes?

    I will try to put more down as I have time.
  5. Mar 4, 2013 #4
    Ah! Amperes law I think to find strength of magnetic field. Yes or no.
  6. Mar 4, 2013 #5


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    Staff: Mentor

    That is the correct approach, right.
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