In a cathode ray experiment, the speed of the particles was determined to be 2.0 x 107 m/s while they were travelling through a 3.5 x 10-4 T magnetic field.  In order to cause the particles to travel in a straight line, an electric field, at right angles to the magnetic field, was created using parallel plates separated by 2.8 cm.  What potential difference would be needed on the plates to cause the particles to travel in a straight line?

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