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
I thought that
Fe= electric force
The Attempt at a Solution
Set it equal to zero o=Fe+Fm
solve for B....that didn't work what am I doing wrong?