Please help! Magnetic field physics question?

What speed would a proton need to achieve in order to circle the earth 1000.0 km above the magnetic equator? Assume that Earth's magnetic field is everywhere perpendicular to the path of the proton and that the Earth's magnetic field has an intensity of 4.00 x 10^ -8 T. (Hint: the magnetic force exterted on... show more What speed would a proton need to achieve in order to circle the earth 1000.0 km above the magnetic equator? Assume that Earth's magnetic field is everywhere perpendicular to the path of the proton and that the Earth's magnetic field has an intensity of 4.00 x 10^ -8 T. (Hint: the magnetic force exterted on the proton is equal to the centripetal force, and the speed needed by the proton is its tangentical speed. Remember that the radius of the circular orbit should also include the radius of the earth. Ignore relativistic effects.)
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