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Homework Help: Direction of Current Flow

  1. Apr 20, 2013 #1
    The direction of Earth's magnetic field in the northern hemisphere is downward and to the north. If an east-west wire moves from north to south, in which direction does the current flow?

    I have no idea how to approach this problem. It was on my physics test and I got it wrong and I'm doing corrections for it right now. All I know is that Earth's geographic North is its magnetic South and vice-versa. The answer is east to west, but why?
  2. jcsd
  3. Apr 20, 2013 #2


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    Staff: Mentor

    Do you know a formula for the net force due to a charge moving through a magnetic field? What determines the direction of the force?
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