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Homework Help: Electromagnetic Induction, the Interplanetary Magnetic Field and the Magnetopause

  1. Feb 19, 2010 #1
    1. The problem statement, all variables and given/known data

    Use the law of electromagnetic induction to deduce what typical voltage would be imposed in the magnetopause by the interplanetary magnetic field, assuming a scale size of the magnetopause of 10Re?

    2. Relevant equations

    -Magnetic flux equation
    -Faraday's law

    3. The attempt at a solution

    See attachment for solution.

    I took the interplanetary magnetic field strength to be 10^-9T (is this right?) and assumed that the magnetopause rotates at the same rate as the Earth.

    Did I get it right? I normally do this sort of calculation for conductors rotating in a magnetic field. In this case one magnetic field is imposing an emf on another magnetic field. Did I have to take into account the strength of the magnetopause?

    Thanks a lot for any advice.

    Attached Files:

  2. jcsd
  3. Feb 20, 2010 #2
    Nothing? I just want to know if my solution makes sense to anyone.


    EDIT: I just realised, I made a mistake in the area calculation. I should have calculated the surface area of a sphere. But apart from that is the method correct?
    Last edited: Feb 20, 2010
  4. Feb 21, 2010 #3
    It looks right with the area change.
    I have to do the exact same question for my lab project.
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