An electron that has a distance of 10.0 cm , is accelerated from rest through a potential difference of 4.50 kV before it enters a region between perpendicular elecric and magnetic fields. The electron moves into a region between positively charged plate and a negatively charged plate, that has a potential difference of 985 V and a distance of 12.8 cm. Determine the magnetic field strength required for the electron to travel undeflected through the fields ?
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