The electron gun electrodes are to be connected as shown on the
sheets for Experiment EF-1. The deflection plates are not used in
this experiment, but they should all be connected to 
(ground).
This prevents any accumulation of static charge on the plates which
might couse spurious deflections.
The solenoids should be connected in series, as shown in the next figure, making sure that the fields of the two coils add. The solenoid current I is measured with the ammeter.
Measure and plot the beam deflection as a function of solenoid
current for several values of accelerating potential
. Can you
predict in advance what the general appearance of the graphs will
be? Next, replot the deflections using as independent variable
(horizontal axis) the quantity 
.
What should the result be and what does it mean?