Question: A current of 3.0 A is flowing through a 40 cm long solenoid with 500 turns. A proton moving at 2.0 x 105 m/s enters the solenoid so that its velocity is perpendicular to the solenoid magnetic field.
Part A: What is the radius of the circular path of the proton inside the solenoid?
I need help to determine the radius of the circular path of the proton inside the solenoid.