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Homework Help: Earth's Magnetic Field with Electron orbit

  1. Nov 30, 2009 #1
    1. The problem statement, all variables and given/known data

    High above the surface of the Earth, charged particles (such as electrons and protons) can become trapped in the Earth's magnetic field in regions known as Van Allen belts. A typical electron in a Van Allen belt has an energy of 55 keV and travels in a roughly circular orbit with an average radius of 240 m. What is the magnitude of the Earth's magnetic field where such an electron orbits?

    2. Relevant equations

    Don't know. I don't see any equation to relates energy to magnetism.

    3. The attempt at a solution

    Don't even know where to begin :frown:

    Please help.

    Thank You
    Last edited: Nov 30, 2009
  2. jcsd
  3. Nov 30, 2009 #2
    nevermind figured it out...
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