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Moose100
#1
Feb26-12, 06:46 PM
P: 32
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
B=unI
r=mv/qB
v=qrB/m



3. The attempt at a solution

B=(12.5*10^-7)(2000/0.5m)(0.7)/sin10=0.020T

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.
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