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Homework Help: Factors that would increase magnetic flux through a coil?

  1. Apr 15, 2012 #1
    24. A square coil is perpendicular to a uniform magnetic field. Which one of the following would increase the magnetic flux through the coil?
    A. Decreasing the area of the coil.
    B. Increasing the number of loops in the coil.
    C. Removing the coil from the magnetic field.
    D. Increasing the strength of the magnetic field.

    Hi there,

    This is a question from a BC Physics 12 provincial. Through all of my notes, my teacher didn't mention magnetic flux once... so I have no idea how to do this. I have found definitions online... "Magnetic flux is the product of the average magnetic field times the perpendicular area that it penetrates." Right...

    Anyways, some background to this type of question and what on earth magnetic flux is to begin with would be MUCH APPRECIATED!

    Thank you very much in advance for any replies.
  2. jcsd
  3. Apr 15, 2012 #2


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    Homework Helper

    That definition is certainly workable.

    Flux = B.A B is the field strength, A is the area

    Clearly increasing either (or both) B and A would do it, however for a muliple looped coil we often write that formula as

    Flux = n.B.A where n is the number or turns, so increasing the number of turns - provided you are adding turns, not merely wrapping the wire into a smaller-sized more-turns coil#

    So two of those options seem possible.

    # for example with 50cm of wire you could probably wrap a 3 turn coil around your hand, but could make a 10 turn coil around a single finger.
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