Physics Demo Number: 128				Approximate Run Time: 10 min
Electrometer, Faraday Ice Pail, and Science Workshop Interface for Electrostatics
Demo Description An Electrometer is hooked to a Faraday Ice Pail via a Science Workshop 750 USB Interface.			Â	Scientific Principles ·Â Â Â Â Â Â Â Â  Charge resides on outside of pail. ·         Charging by Induction.
Equipment ·         Electrometer ·         Ice Pail ·         ScienceWorkshop750 Interface	Â	Equipment Location ·         Kit (128) on [B-1-4] contains the Electrometer and Ice Pail ·         The Science Workshop 750 Interface is in Kit on [B-1-4].
Instructions   The first photo shows the Electrometer, with its signal input and ground cables attached on the right side, and its signal output cable attached on the left side. The second photo shows the signal input cable of the Electrometer attached to the the inner cage (regarded as the Ice Pail) and to the outer basket( regarded as a Shield for external fields) of the "Pasco Faraday Ice Pail" object, while the signal output cable of the Electrometer runs down to connect to the ScienceWorkshop750 Interface , whose output goes to a USB port on the lecture hall PC. Â
The third photo shows the result of inserting /removing a negatively charged rubber rod (with no mechanical contact of rod with inner cage) several times into the Faraday Ice Pail while displaying the voltages on the PC monitor with the help of Data Studio software. The resulting Lecture Hall video screen output is as seen in the next photo ( number four) if one selects the PC output on the Lecture Hall interface controller screen. Note that one may also present the output of the Electrometer as a meter display in the software, as seen in the following photo number five, which is probably more easily grasped by the students than the method of the above photo number four. Writeup created by David A. Burba Copyright © 2014, Vanderbilt University.   All Rights Reserved.   Â