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1. At what distance along the central perpendicular axis of a uniformly charged plastic disk of...

1. At what distance along the central perpendicular axis of a uniformly charged plastic disk of radius 2 m is the magnitude of the electric field equal to one half the magnitude of the field at the center of the surface of the disk? Note: You must derive the formula for the electric field for the disk in order to recieve full credit.

2. A proton is placed in a uniform magnetic field B = 1.2 mT. If the proton an initial velocityof 3.2 X 10^7 m/s at angle of 30 degrees relative to the background magnetic field, what is the force on the charge due to the field? What is the acceleration produced by this force on the proton?

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