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 electrons path. Find the current in the solenoid if it has
Answer in units of mA
2. Relevant equations
I think you can use B=uIN
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?