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Homework Help: Springs and currents Question

  1. Jul 27, 2004 #1
    I have the following problem on which I am unsure how to proceed.

    A spring with a spring constant K = 20 N/m is shown below. It is stretched 1 cm from its equilibrium position when a current I passes through the wire. How big is the current in the wire?

    The magnetic field is coming out of the page and is B = .5T, the length of the area is 20cm.
    | || |
    | || |
    \/\/\/\/\/\/\/\/\/\/\/\/\/\/\|| |
    | || |
    | || | 20 cm
    | || |
  2. jcsd
  3. Jul 28, 2004 #2

    Doc Al

    User Avatar

    Staff: Mentor

    You'll need to know the force on a current-carrying wire in a magnetic field: F = ILB, assuming the field is perpendicular to the wire. And you'll need to know about springs: F = -kx.
  4. Jul 28, 2004 #3

    Thanks alot
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