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A long solenoid has 80 turns/cm and carries current i. An electron moves within the solenoid...

A long solenoid has 80 turns/cm and carries current i. An electron moves within the solenoid in a circle of radius 1.40 cm perpendicular to the solenoid axis. The speed of the electron is 0.0370c (c = speed of light). Find current i.

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