Instruction manual

2
Faraday Ice Pail 012-04393B
®
➁ Ground the ice pail (i.e., connect the inner pail to the
shield) by touching the inner pail and the outer shield
at the same time with the finger of one hand. (See Fig-
ure 2) While conducting the experiment it may be
convenient to continually rest one hand on the upper
edge of the shield. This also grounds the experimenter,
providing the electrometer is connected to both
ground and shield and it allows the ice pail to be easily
grounded whenever necessary.
➤ NOTE: When removing your finger from the
inner pail after grounding it, make certain that you
are still touching the outer shield. DO NOT remove
your hand from the shield before releasing the inner
pail, as this sequence will not effectively ground the
inner pail.
➂ Make sure the electrometer reads “zero”, indicating
that there is no charge on the ice pail.
Procedure A
➀ Rub two charge producers together to create a charge
on them.
➁ Insert one of the wands into the ice pail but do not let
it touch the pail. Note the electrometer reading.
➂ Remove the object from the pail and again note the
electrometer reading.
➃ Insert the wand again, allow it to touch the ice pail and
then remove it. Note the electrometer reading.
➄ Momentarily ground the ice pail and then touch the
object to the pail again. Note the electrometer reading.
Does any charge remain on the object?
What is the conclusion about the induced charge on the ice
pail, as compared to the charge on the charge producer?
➤ NOTE:
➀ The charged object must be inserted at least into the
lower half of the ice pail. Try inserting it, for example,
approximately one centimeter below the top of the pail
and attempt to explain your results.
➁ There may be a small charge retained on the exposed
plastic between the aluminum disk and the aluminum
rod on the charge producers. This residual charge does
not transfer readily when the disk is touched to the
pail. Therefore, (before starting the experiment)
breathe on the exposed plastic of the charge producer
so that the moisture in your breath will tend to remove
any residual charge.
Procedure B
➀ Starting with initially uncharged charge producers,
rub the blue and white materials together. Using the
Faraday Ice Pail, measure the magnitude and polarity
of their charges. By using the results from Procedure
A it is not necessary to touch the charge producer to
the pail. What relationship exists between these
charges produced by contact?
➁ Ground the charge producers and rub them together
inside the ice pail. What is the reading on the elec-
trometer. Remove one charge producer and note the
electrometer reading. Replace this charge producer but
remove the other and note the electrometer reading.
➂ Ground the charge producers again. Rub the white
material against the aluminum proof plane. Measure
the magnitude and polarity of the charges. Now rub
the blue material against the aluminum surface and
record your measurements.
➃ Construct a list of materials such that if a material
lower on the list is rubbed against a material higher on
the list, the charge on the higher listed material is al-
ways positive. Such a list is called an electrostatic series.
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Figure 2