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Homework Help: Applications of electromagnetism

  1. May 20, 2014 #1
    1. The problem statement, all variables and given/known data

    Is the magnetic force the Earth exerts on a compass needle greater than, equal to, or less that the force the compass needle exerts on Earth? Explain.

    2. Relevant equations

    3. The attempt at a solution
    I attempted to analyze the forces as if they behaved as newton's forces, i.e. by stating that in an action reaction pair the forces must be equal and opposite. I started to compare the magnetic forces to action reaction pairs in gravity, and how a force that earth exerts on a falling object equals the force that said object exerts on Earth. However, I'm not sure if that's correct because I don't know if magnetic forces behave the same way as magnetic forces.
  2. jcsd
  3. May 20, 2014 #2


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    Staff: Mentor

    I hope so (bold from me) ;).

    Newton's laws apply to all types of forces.
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