Two very large parallel plates of charge are separated by 1.5 cm. The potential difference between the plates is 450 V. A small, positively charged particle flies horizontally between the plates with a speed of 3 x 10^5 m/s.
If we apply a uniform magnetic field, it is possible to allow the particle to pass through the plates without being deflected (i. e., the particle's velocity never changes direction).
(a) What is the direction of the magnetic field necessary to accomplish this goal?
(b) What is the magnitude of the magnetic field necessary to accomplish this goal?
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