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A direct current flowing through tbe win...

A direct current flowing through tbe winding of a long cylindrical solenoid ofradius R produces a uniform magnetic induction B in it. An electron travelling at velocity v enters into tbe solenoid along the radial direction between its turn at right angles to the solenoid axis. After a certain time tbe electron deflected by magnetic field leaves the solenoid. Calculate the time which the electron spends inside the solenoid.

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