(Hint: Review Ch. 22 and 10 )
Launch the electron for negative values of the field component. What is the sign of the charge of the upper plate for these values. The lower plate?
Launch the electron for positive values of the field component. What is the sign of the charge of the upper plate for these values. The lower plate?
When the field component = +12 N/C, what is the value of the y-component of velocity just before the electron hits the detector ? What is your answer when field component = +8 N/C? +4 N/C? (Hint: use the time of flight and Chapter 10 theory of projectile motion.)
Question 4 (Extra Credit)
Fill in the data table for a plot of the change in y vs Ey. You must measure the change in y using click and drag.
|Ey (N/C)||change in y|
Plot the above data in Excel. From the slope of the line through the data points, find the charge to mass ratio e/m. Compare with the theoretical ratio by finding the percent error.