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Loops current

  1. Jul 9, 2008 #1
    Two loops have current flowing through them (see picture). The top loop lies directly above the bottom one. When the current in the bottom loop is increased, what happens to the top loop's current? Does it increase, decrease, go to zero, doesnt change or it depends on the relative values for current.

    http://img167.imageshack.us/img167/56/loopto0.th.png [Broken]

    I was thinking that this had something to do with Lenz's Law. So I was thinking when the top current increase, the bottom would try to counter it by also increasing? But there is no magnetic field involved?
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Jul 9, 2008 #2
    the current in above one should decrease.

    i hope the diagram is correct ((current in both of them is clockwise .))

    so by right hand thumb rule magnetic field would be in upper direction
    as current increases it would also increase the mag. F
    now by lenz's law current in above should decrease.
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