An electron is moving at a speed of 1.2 x 104 meter per second in a circular path of radius of 2.1 centimeter inside a solenoid. The magnetic field of the solenoid is perpendicular to the plane of the electron's path. The solenoid has 25 turns per centimeter.
(a) Obtain the strength of the magnetic field inside solenoid.
____________ T
(b) Evaluate the current in the solenoid.
_______________ mA