1. The problem statement, all variables and given/known data An electron circles at a speed of 8510 m/s in a radius of 2.42 cm in a solenoid. The magnetic ﬁeld of the solenoid is perpendicular to the plane of the electron’s path. Find the current in the solenoid if it has 23.3 turns/cm. Answer in units of mA 2. Relevant equations I think you can use B=uIN I=B/(uN) u is the universal vacuum permittivity constant, n is the number of turns 3. The attempt at a solution I already calculated force to be 2e-6. There are 56.386 turns total because 23.3*2.42 so I got 2e-6/(4pi*10^-7*56.386)=0.02822 so 28.22 mA I punched this in and it was wrong. Did I do something weird?