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012-04346B
Instruction Manual and
05/91
Experiment Guide for
the PASCO scientific
Model PK-9023
EQUIPOTENTIAL AND
FIELD MAPPER
Copyright © October 1990 $5.00
Instructional Manual and
Experiment Guide for the
PASCO scientific Model
PK-9023
FIELD MAPPER
Instructional Manual and
Experiment Guide for the
P P ASC K-9023 O scientific Model
FIELD MAPPER
scientific
scientific
10101 Foothills Blvd. • P. O. Box 619011 • Roseville, CA 95661-9011 USA
Phone (916) 786-
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012-04346B Table of Contents Section Page Copyright, Warranty, and Equipment Return................................................... ii Introduction ...................................................................................................... 1 Equipment......................................................................................................... 1 Equipment Setup............................................................................................... 2 Experiments Pa
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012-04346B Copyright and Warranty Please—Feel free to duplicate this manual subject to the copyright restrictions below. Copyright Notice The PASCO scientific Model PK-9023 Equipotential and which is deemed to be defective in material or workman- Field Mapper manual is copyrighted and all rights reserved. ship. This warranty does not cover damage to the product However, permission is granted to non-profit educational caused by abuse or improper use. Determination of whether institutions for rep
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012-04346B Introduction The PASCO scientific MODEL PK-9023 Field Mapper consists of two basic elements. The first is a carbon impreg- nated paper in the resistance range of 5 KΩ to 20 KΩ per square. This paper forms the conducting medium or space between the electrodes. The second element is a conductive ink dispensed from a pen. The ink is produced from silver particles in a suspension liquid. As the ink dries, the silver flakes settle on top of each other forming a conductive path, + - (o
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012-04346B Equipment Setup IMPORTANT: The silver conductive ink reaches its maximum conductivity after 20 minutes drying time. For optimal results plan the timetable for conducting the experiments and correlate drawing the conductive ink paths accordingly. 1. Plan and sketch the layout (size, shape and relative spacing) of the charged paths to be studied on a piece of scratch paper. These paths can be any two dimensional shape, such as straight or curved lines, circles, dots, squares, etc. Sin
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012-04346B 4. Connect the electrodes to a battery, DC power supply, 5. To check the electrodes for proper conductivity connect or any other potential source in the 5 to 20 VDC range one voltmeter lead near the push pin on an electrode. using the supplied connecting wires. (see Figure 4) The Touch the voltmeter’s second lead to other points on the potential source should be capable of supplying 25 mA. same electrode. If the electrode has been properly (If possible, the potential should be equal
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012-04346B arrow. Repeat the action of pivoting and touching with dipole and select a new point at which to place the the front lead until the potential reading in a given voltmeter's ground lead. Again probe with the other lead direction is highest. Draw a new arrow. Repeat the until the direction of highest potential difference is action of putting the ground lead at the tip (head) of found. Draw an arrow from the ground lead to the other each new arrow and finding the direction in which the l
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012-04346B Experiments The following are only some suggested experiments in NOTE: Only power supply connections are shown mapping equipotentials and field gradients using the PASCO in the following schematics. Voltmeter connections Field Mapper. The true value of the equipment, lies in its are not shown because they vary depending on complete flexibility permitting the user to design any system whether equipotentials or field gradients are being of charged bodies and then to map the equipoten
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012-04346B Dipoles of Opposite Charge Dipoles of Like Charge + + Questions Questions How does the field of this configuration compare with What is the relation between the direction of a maximum dipoles of opposite charge? (See experiment “Dipoles of value field gradient and equipotential line at the same point? Opposite Charge”.) (A geometrical relation is desired.) What distortion of the field is produced by the large elec- What effect does the finite size of the black paper have on trode ar
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012-04346B Floating Insulator Floating Electrode Rectangular cut-out + + Before drawing the circular electrode, map the equipotentials of the two straight electrodes. Draw the circular electrode Before cutting the rectangular insulator, map the and again map the equipotentials. equipotentials of the two straight electrodes. Cut out a rectangular section of the paper and again map the Questions equipotentials. How does the circular electrode distort the field? Questions How does the rectangular
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012-04346B Line and Circular Source Line and “Sharp” Point a b a + + a c At first, do not draw the two electrodes marked “a.” Map the equipotentials. Add the electrodes “a” and again map the Draw only the line and point source “a.” Map the equipotentials. equipotentials. Add circular electrode “b” and again map the equipotentials. Add circular electrode “c” and again map the Questions equipotentials. What effect did adding the extra electrodes have on the Questions spacing of the equipotent
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012-04346B Triode flow and electric fields. In particular, the velocity potential of an incompressible fluid where the flow is both steady and Equipment needed but not supplied: 5K Potentiometer not rotational satisfies the Laplace equation. A steady flow of water is a good approximately of this type of flow. Now the flow is generated by “sources” which supply fluid and “sinks” which absorb fluid. We are interested in the “streamlines” which can be thought of as lines traced out by a particu
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012-04346B Notes scientific 10
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012-04346B Appendix scientific 11
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012-04346B scientific 12
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Technical Support Contacting Technical Support Feedback Before you call the PASCO Technical Support staff, If you have any comments about the product or it would be helpful to prepare the following infor- manual, please let us know. If you have any sugges- mation: tions on alternate experiments or find a problem in the manual, please tell us. PASCO appreciates any ➤ If your problem is with the PASCO apparatus, customer feedback. Your input helps us evaluate and note: improve our product. - Ti
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