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## Homework Statement

An electron travels with speed 1.0 x 107

m/s between the two parallel charged

plates shown in the adjacent figure. The

plates are separated by 1.0 cm and are

charged by a 200 V battery. What magnetic

field strength and direction will allow the

electron to pass between the plates without

being deflected?

## Homework Equations

B=([tex]\mu[/tex]/4[tex]\pi[/tex])(qvsin[tex]\theta[/tex]/r[tex]^{2}[/tex])

## The Attempt at a Solution

well im pretty sure that F=0N, and the the direction the field has to be in the same direction of the velocity, so sin(theta)=0...... but i have no idea how find the field strength, anyone have any ideas???