Problem a cosmic ray electron moves at 725 x 106 ms, Ask an Expert

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Problem: A cosmic ray electron moves at 7.25 x 10⁶ m/s perpendicular to the earth's magnetic field at an altitude where field strength is 1.25 x 10^-5 T.

Part A: What is the radius of the circular path the electron follows?

I need help to find the radius of the circular path the electron follows.

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