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An electron travels with speed 1.0 X 10^7 m/s between two parallel charged plates. The plates are separated by 1.0 cm and are charged by a 200V battery. What magnetic field strength and direction will allow the electron to pass between the plates without being deflected.?

F= qvBsin[tex]\theta[/tex]

V=Ed

E=V/d = 200V/(1X10^-2)= 20,000. That is the strength of the E-field. Would this also be the force acting on the electron?

If so i could set the top equation(force equation) equal to this. When i did this i came out with a HUGE number for the Magnetic field... umm for the the magnetic field to not have any impact(cause deflection) on the traveling electron it would have to be going in the same direction as the electron. in which case sin[tex]\theta[/tex] where it would be sin(0) is 0.. thus the force would be zero. I may just be confusing myself. Help please

link for a diagram http://img81.imageshack.us/img81/7625/platediagramkl3.jpg [Broken]

F= qvBsin[tex]\theta[/tex]

V=Ed

E=V/d = 200V/(1X10^-2)= 20,000. That is the strength of the E-field. Would this also be the force acting on the electron?

If so i could set the top equation(force equation) equal to this. When i did this i came out with a HUGE number for the Magnetic field... umm for the the magnetic field to not have any impact(cause deflection) on the traveling electron it would have to be going in the same direction as the electron. in which case sin[tex]\theta[/tex] where it would be sin(0) is 0.. thus the force would be zero. I may just be confusing myself. Help please

link for a diagram http://img81.imageshack.us/img81/7625/platediagramkl3.jpg [Broken]

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