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OpenStudy (anonymous):
An electron is shot into one end of a solenoid. As it enters the uniform magnetic field within the solenoid, it's speed of 800 m/s and its velocity vector makes an angle of 30 degrees with the central axis of the solenoid. The solenoid carries 4 A and has 8000 turns along its length. How many revolutions does the electron make along its helical path within the solenoid by the time it emerges from the solenoids opposite end?
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