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Q. A proton moving at 4.0 10^6 m/s through a magnetic field of magnitude 1.70 T experiences a magnetic force of magnitude 8.20 10^-13 N. What is the angle between the proton's velocity and the field?

Q. An electric field of 7.85 10^5 V/m is desired between two parallel plates, each of area 42.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate?

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