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Homework Help: Direction of current in a magnetic field when loop is square

  1. Nov 10, 2015 #1
    1. The problem statement, all variables and given/known data
    A flexible wire loop has a radius of r = 0.178 m and it is inside a uniform magnetic field of B = 0.332 T. The loop is grasped at points P and Q and stretched until its area is zero. It takes 0.146 s to close the loop.

    2. Relevant equations
    EMF = ∆Phi/∆t
    Phi = magnetic flux

    3. The attempt at a solution
    Used the formula above.

    So where is current induced? In the wire? Due to the change in magnetic field then? Or magnetic flux? How do I find its direction... I mean, I know if you have magnetic field, then you use right hand rule, right? Anyway, how do I find direction here?
  2. jcsd
  3. Nov 11, 2015 #2


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    Homework Helper

    The same thing happens when a loop rotates in a magnetic field - the exposed area to the constant magnetic field changes, although the amount of turns in the coil stays the same.
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