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An electron enters a magnetic field of 0.64 T with a velocity perpendicular to the direction of the field. What is the value f ×10^-10, where f is the frequency (in Hz) at which the electron traverse a circular path? (The mass of an electron is 9.1×10^-31 kg and the charge of an electron is 1.6×10^-19C). Express the answer with two decimal places.

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