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A velocity selector in a mass spectrometer uses an electric field of 4.9 x 105 V/m....

A velocity selector in a mass spectrometer uses an electric field of 4.9 x 105 V/m. What magnetic field strength (in Tesla) is needed to select a speed of 4 x 106 m/s? Your answer should be a number with three decimal places, do not include the unit.

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