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Physics help...
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March 16th, 2008
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an electron moving with a speed of 2×10^6 m\s perpendicular to a uniform magnetic field of 10^-3 T will execute one revolution of a circular path in a time most nearly
(a) 1s (b) 10^-6s© 10^-8s (d) 10^-10s (e) 10^-15s
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