By winding the long cylindrical solenoid of radius R takes a constant current, which creates a uniform inside the solenoid magnetic field of B. In the solenoid coils of it flies in the radial (perpendicular
axis of the solenoid), the electron velocity v (see Figure). Deviating in a magnetic field, the electron after some time left solenoid. Determine the time T of the electron motion inside the solenoid.
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