- #1
talaroue
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Homework Statement
An electron travels with speed 4.91×107 m/s between the two parallel charged plates. The plates are separated by s=1.47 cm and are charged by a 203 V battery. What magnetic field strength will allow the electron to pass between the plates without being deflected?
----------+------- < postive plate
>>>>O < electron
----------(-)------- < negative plate
Homework Equations
I thought that
Fnet=Fe+Fm
Fe= electric force
Fm=magnetic force
The Attempt at a Solution
Set it equal to zero o=Fe+Fm
Fe=Fm
(Kq1)/(r^2)=qVB
solve for B...that didn't work what am I doing wrong?