• Turn the power supply on and wait for the electron beam path to become visible. The initial acceleration voltage is 200 V.
• Increase the coil current until the electrons move in a circle of radius r = 5 cm or diameter 10 cm. (Take some time to adjust the current carefully.)
• Paste the table below into an Excel spreadsheet and enter your measured value for the coil current into the table.
• Repeat for the other accelerating voltages in the table.
• Let Excel calculate the remaining columns in the table.
• Produce a graph of 2V versus(Br)² and label the axes.
• Add a trendline, set the intercept to zero, and display the equation on the chart. Format the trendline label Scientific, 2 decimal places.

Insert your table and your graph into your Word document.

What is the slope of your trendline? (Note: The slope will have units (J/C)/(Tm)² = C/kg.)

What is your measured value of e/m?

Calculate e/m from the accepted values of the electron's charge and mass. Does the value of e/m from your experiment agree with the calculated value? Given your experimental procedure, how close do you expect them to agree?