Page 2 - Basic Electrostatics System; Ta b l e o f C o n t e n ts
Basic Electrostatics System 012-07227G ES-9080A 2 ® Ta b l e o f C o n t e n ts Equipment List.............................................................................................. 3 Introduction....................................................................................................
Page 3 - E q u i p m e n t L i s t; Included Equipment; Electrostatics Voltage Source (cable and AC adapter not shown)
® ES-9080A 012-07227G Basic Electrostatics System 3 Basic Electrostatics System ES-9080A E q u i p m e n t L i s t Included Equipment Model Number* 1. Basic Electrometer (cables not shown) ES-9078A 2. Electrostatics Voltage Source (cable and AC adapter not shown) ES-9077 3. Basic Variable Capacitor ...
Page 4 - I n t r o d u c t i o n; PASCO; Additional Equipment; PASCO data acquisition Interface and software
Basic Electrostatics System ES-9080A 4 ® *Use Model Numbers to expedite replacement orders. I n t r o d u c t i o n Demonstrations of electrostatic phenomenon have traditionally been limited to the simplest experiments, using the most elementary equipment, because of problems with technique and appa...
Page 5 - a demonstrator’s unfamiliarity with the equipment and procedure.; E q u i p m e n t D e s c r i p t i o n
® ES-9080A 012-07227G Basic Electrostatics System 5 day can cause charge to easily build up in any moving object, including people. Minimize all movement when demonstrating on a very dry day. • Practice - Nothing can ruin the instructive value of a demonstration more than failure due to a demonstrat...
Page 6 - Figure 1: Front Panel Controls of the Electrometer; Figure 2: Electrostatics Voltage Source
Basic Electrostatics System ES-9080A 6 ® With these features, you’ll find that your electrostatics demonstrations and labs are easier to perform and, with quantitative data, are more informative. The electrometer is powered by four AA-alkaline batteries (included) that can be replaced by opening the...
Page 7 - Figure 3: Variable Capacitor
® ES-9080A 012-07227G Basic Electrostatics System 7 Variable Capacitor (ES-9079) The PASCO experimental variable capacitor consists of two conductivel plates, 20 cm in diameter, which can be adjusted to various separations. The movable plate is mounted on a calibrated slide which gives the plate sep...
Page 8 - produce sufficient charge for use with a standard electroscope.; Figure 5: Proof Plane; Figure 6: Proof Plane in Faraday Ice Pail
Basic Electrostatics System ES-9080A 8 ® • Avoid touching the neck during normal use. The oils from your hands will provide a path for charges to leak off. If you experience a lot of leakage, wash the white non-conductive neck with soap and water, rinsing generously; the leakage should disappear. Oc...
Page 9 - Figure 8: Faraday Ice Pail
® ES-9080A 012-07227G Basic Electrostatics System 9 Figure 7 shows the recommended method for using the proof plane to sample charge on a conductive sphere. Use the conductive knob on the end of the proof plane to sample the charge density inside a hollow sphere (such as ES-9061 Conductive Shapes). ...
Page 10 - inside
Basic Electrostatics System ES-9080A 10 ® To prevent stray charges from producing erroneous results, it is extremely important that the Faraday Ice Pail be momentarily grounded prior to starting any experiment. The demonstrator must also be continually grounded while performing an experiment. The Ch...
Page 11 - NOTE; E l e c t r o m e t e r O p e r a t i o n a n d S e t u p R e q u i r e m e n ts; generator of a Wimshurst machine.; S e t u p; Connect the ground post of the electrometer to an earth ground.
® ES-9080A 012-07227G Basic Electrostatics System 11 NOTE : When handling the conductive shapes, take care to keep each shape and non- conductive rod free of dirt, grease, and fingerprints to minimize leakage of charge from the shapes. Five binding posts allow the voltage source and/or the electrome...
Page 12 - Important Points for General Operation:
Basic Electrostatics System ES-9080A 12 ® 5. Use the push button to set the voltage to the desired range. The range setting refers to the voltage input required to produce a full-scale meter deflection (e.g., a setting of 30 means that a full-scale meter deflection indicates a voltage of 30 volts). ...
Page 13 - D e m o n s t r a t i o n 1 : F a r a d a y I c e P a i l a n d C h a r g e P r o d u c t i o n; Suggestions for Introducing the Experiment; Earth ground connection
® ES-9080A 012-07227G Basic Electrostatics System 13 D e m o n s t r a t i o n 1 : F a r a d a y I c e P a i l a n d C h a r g e P r o d u c t i o n Suggestions for Introducing the Experiment Start by showing that the electrometer is directly measuring potential difference by connecting a battery to...
Page 14 - WARNING; Procedure 1A: Charging by Induction vs. Charging by Contact
Basic Electrostatics System ES-9080A 14 ® Before beginning any experiment using the ice pail, the pail must be momentarily grounded. When the ice pail is connected to the electrometer, and the electrometer is connected to an earth-ground, simply press the ZERO button whenever you need to discharge b...
Page 15 - Push the ZERO
® ES-9080A 012-07227G Basic Electrostatics System 15 • Before inserting the charged disk in the ice pail, make sure you’re touching the grounded shield. 4. Carefully insert the charged object into the ice pail, all the way to the lower half of the pail, but without letting it touch the pail. Note th...
Page 16 - Extra Things to Try
Basic Electrostatics System ES-9080A 16 ® 5. Remove one charge producer and note the electrometer reading. Replace the charge producer and remove the other. Note the electrometer readings. Using the magnitude and polarity of the measurements, comment on conservation of charge. Extra Things to Try 1....
Page 17 - D e m o n s t r a t i o n 2 : C h a r g e D i s t r i b u t i o n; Equipment Setup; Proof Plane
® ES-9080A 012-07227G Basic Electrostatics System 17 D e m o n s t r a t i o n 2 : C h a r g e D i s t r i b u t i o n Equipment Setup Introduction The purpose of this demonstration is to investigate the way charge is distributed over a surface by measuring variations of charge density. A charged su...
Page 18 - Analysis
Basic Electrostatics System ES-9080A 18 ® However, by not grounding the proof plane (and by not letting it touch the ice pail), the charge on the surface is not depleted. That charge which the proof plane removed for one measurement is always returned to the surface when the next sampling is made. N...
Page 19 - Conductive Conical Shape
® ES-9080A 012-07227G Basic Electrostatics System 19 Conductive Conical Shape 1. Remove the two conducting spheres. Connect the conductive conical shape to the +2000 VDC port on the Electrostatics Voltage Source. 2. Use the proof plane to sample charge at the larger rounded end and then at the narro...
Page 21 - D e m o n s t r a t i o n 3 : C a pa c i ta n c e a n d D i e l e c t r i c s; Introduction; Voltmeter; Figure 3.1: Ideal Schematic of the Electrometer
® ES-9080A 012-07227G Basic Electrostatics System 21 D e m o n s t r a t i o n 3 : C a pa c i ta n c e a n d D i e l e c t r i c s Introduction The purpose of this series of demonstrations is to investigate the relationship between charge, voltage and capacitance for a parallel plate capacitor. Each...
Page 22 - Procedure 3A: Measuring the Electrometer’s Capacitance
Basic Electrostatics System ES-9080A 22 ® Procedure 3A: Measuring the Electrometer’s Capacitance Use this procedure to measure a precise value of the capacitance provided by the electrometer and all cables connected to it. If you are interested in qualitative, rather than quantitative experiments, t...
Page 23 - Press the; ZERO; plates of the capacitor.
® ES-9080A 012-07227G Basic Electrostatics System 23 voltage source. Take care to place the capacitor sufficiently far away from the sphere and the voltage source, to prevent it from being charged by induction. 2. Press the ZERO button to remove any residual charge from the electrometer and the plat...
Page 24 - potential now? Compare the values to the previous case.
Basic Electrostatics System ES-9080A 24 ® 5. Double the plate separation to 4 mm and repeat the procedure. What happens to the potential now? Compare the values to the previous case. 3B.2: Q Measured, C Variable, V Constant 1. Figure 3.3a above shows the equipment set up. The Basic Variable Capacito...
Page 26 - How does the potential vary with capacitance?
Basic Electrostatics System ES-9080A 26 ® 3B.4: V Measured, C Variable, Q Constant 1. Figure 3.4 shows the equipment set up. The Variable Capacitor is connected to the electrometer and the electrometer is grounded to earth (through the COM port on the voltage source). The voltage source will be used...
Page 27 - The ideal procedure to measure
® ES-9080A 012-07227G Basic Electrostatics System 27 The ideal procedure to measure would be to simply slip a piece of dielectric material between a set of charged capacitor plates and then note the changes in potential. However, sliding a dielectric between the plates of the capacitor when they a...
Page 28 - After inserting the dielectric...; Figure 3.6: Circuit diagrams with and without the dielectric
Basic Electrostatics System ES-9080A 28 ® 5. After inserting the dielectric, return the plates to the original 3 mm separation and record the new electrometer reading, V f . 6. Pull the plates apart again, and lift and carefully remove the dielectric sheet. 7. Return the plates to the original 3 mm ...
Page 29 - After some algebra and rearranging, you find that; Material
® ES-9080A 012-07227G Basic Electrostatics System 29 After some algebra and rearranging, you find that where the ratio C´ p / C p is the dielectric coefficient : Table 3.1: Some Dielectric Coefficients Procedure 3D: Capacitors in Series and in Parallel The purpose of this demonstration is to exami...
Page 30 - CV
Basic Electrostatics System ES-9080A 30 ® 3D.1: Capacitors in Series Make sure all capacitors are uncharged before connecting them. (Use a short wire to momentarily short each one.) 1. Set up the series circuit, as shown in Figure 3.7a. 2. Plug in to the 30 VDC output on the Voltage Source. Close sw...
Page 31 - D e m o n s t r a t i o n 4 : C h a r g i n g a n d D i s c h a r g i n g C a pa c i t o r s; Computer with; R C
® ES-9080A 012-07227G Basic Electrostatics System 31 D e m o n s t r a t i o n 4 : C h a r g i n g a n d D i s c h a r g i n g C a pa c i t o r s Introduction The purpose of this demonstration is to investigate how the voltages across a capacitor and a resistor vary as the capacitor charges and disc...
Page 32 - Figure 4.1: Experimental Setup and Circuit
Basic Electrostatics System ES-9080A 32 ® 2. Set up the circuit shown in Figure 4.1, where the resistor and the capacitor are connected in series to the voltage source, set at 30 VDC. The electrometer output goes to one of the analog channels of the PASCO interface . Use a single-pole double-throw s...
Page 33 - RC; is the voltage of the; Experimental Setup; Figure 4.2: Charging and Discharging with a Square Wave Signal
® ES-9080A 012-07227G Basic Electrostatics System 33 the voltage across (and the charge on) the capacitor decreases with time according to the equation . After a time t = RC (one time constant), the voltage across the capacitor decreases to 37% its maximum value. 3. Determine how much is 37% of the ...
Page 34 - also connected to one of the analog channels of the
Basic Electrostatics System ES-9080A 34 ® a resistance of 1000 he electrometer is reading the voltage across the capacitor, and it is also connected to one of the analog channels of the PASCO interface. 2. With the DataStudio software, create a display of voltage vs. time for the readings of th...
Page 35 - A p p e n d i x A : C o p y r i g h t a n d Wa r r a n t y I n f o r m a t i o n; Copyright Notice; A p p e n d i x B : Te c h n i c a l S u p p o r t; Address: PASCO scientific
® ES-9080A 012-07227G Basic Electrostatics System 35 A p p e n d i x A : C o p y r i g h t a n d Wa r r a n t y I n f o r m a t i o n Copyright Notice The PASCO scientific 012-07227G Basic Electrostatics System Manual is copyrighted and all rights reserved. However, permission is granted to non-prof...
Page 36 - Product End of Life Disposal Instructions:; must not; be disposed of in a standard
Basic Electrostatics System ES-9080A 36 ® Product End of Life Disposal Instructions: This electronic product is subject to disposal and recycling regulations that vary by country and region. It is your responsibility to recycle your electronic equipment per your local environmental laws and regulati...
