# Electron speed

1. Feb 28, 2009

### phy112

1. The problem statement, all variables and given/known data

An electron moves with speed 9.50 105 m/s in a uniform magnetic field of 4.4 T, pointing south. At one instant, the electron experiences an upward magnetic force of 3.40 10-14 N. In what possible directions might the electron be moving at that instant? Give your answers as angles clockwise from south (from 0° to 360°), in increasing degrees.

2. Relevant equations

F=qB(vsin theta)

3. The attempt at a solution
I keep trying to plug all the knowns into this equation but i cannot seem to find the right answer.
3.4e-14=(1.6e-19)(4.4)(9.5e5sin theta) and find inverse.

the 2 answers should be clockwise from south

2. Mar 1, 2009

### tiny-tim

Hi phy112!

(have a theta: θ )
just solve for sinθ … should give you two answers

3. Mar 1, 2009

### phy112

i did that and got an angle of 2.91. that isnt right though. i am wondering if there is another step im missing.

4. Mar 1, 2009

### tiny-tim

You should have got two angles.

5. Mar 1, 2009

### phy112

arent the two angles the same??