1. The problem statement, all variables and given/known data
A certain solenoid(50cm long with 2000 loops) carries a current of 0.70A and is in vacuum. An electron is shot at an angle of 10deg to the solenoid axis from a point on the axis.
Find the speed of the electron if it is just to miss hitting the inside of the 1.6cm diameter solenoid?
2. Relevant equations
3. The attempt at a solution
v=0.20T * 0.008m*1.6*10^-19C=2.8*10^7m/s<<<the manual says the velocity is 1.4*10^7 don't understand why it's half of what I got. Please help.