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"An electron moves at a speed of 9000 m/s in
a circular path of radius 1.1 cm in a solenoid.
The magnetic field of the solenoid is perpendicular to the plane of the electron’s path.
The permeability of free space is 4 π ×
T · m/A.
Find the strength of the magnetic field inside the solenoid.
Answer in units of µT"
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