Phys 132 Lab 6

.pdf

School

University of Illinois, Chicago *

*We aren’t endorsed by this school

Course

132

Subject

Physics

Date

Apr 3, 2024

Type

pdf

Pages

Uploaded by ChefSeaUrchinPerson1017

UIC Physics Department Physics 132 Laboratory Experiment Equipotentials (Experimental Procedure and Data Analysis) This part of the lab must be completed entirely independently of your lab partner(s) or other students. Make sure that you avoid unauthorized collaboration and plagiarism. All suspected violations of the Standards of Conduct will be referred to Student Judicial Affairs. Lab Section (Day & Time): [ A 1Oown Name:- Station #: Parallel Plate Capacitor 1. Ensure you have all of the required materials: = Plastic Backing-Board = 3 Sheets of Carbon Paper = 6 Aluminum Pieces 2 Long Bars 2 Short Bars 1 Large Ring 1 Small Ring = 12 pointed Spade Screws & Wing Nuts = Adjustable 30V Power Supply = Digital Multimeter with Cable & Probe = Black & Red Cables with Alligator Clips = Tape 2. First, tape down a piece of carbon paper onto the backing-board, ensure the paper is large enough to cover up all of the holes. (Figure 14) 3. We will use spade screws and wing nuts to attach the two short aluminum bars. First, check the charge distribution layout (previous page) to see which holes you will use. Equipotentials Page 4 of 8

UIC Physics Department Physics 132 Laboratory Experiment 4. Press a spade screw into a hole on the board from the back side, using your fingers to press down on the carbon paper from the front, piercing the carbon paper. (Figure 15) 5. Insert the aluminum piece onto the screw tip and secure with a wing nut. Repeat for all of the holes on the bars. Make sure to secure the wing nuts QUITE TIGHTLY, otherwise your results will not be ideal. (Figure 10) 6. Make sure the Power Supply is turned off. Follow the diagram above to connect your cables properly. Note that the ends with the alligator clips should be connected to the spade screw heads underneath the backing-board. Look at the pictures under “Charge Distribution Layouts” to see which color cable connects to which piece. 7. Turn on Power Supply and set a voltage to 30 V. 8. Turn on the multimeter to read DC Voltage, and with the needle probe check the voltage of both aluminum pieces. The top one should read ~ 30V while the bottom one should read 0V. If successful, you are ready to move on. 9. Measure and draw the equipotential lines for 9V, 12V, 15V, 18V, and 21V using your WHITE pencil. The technique? Simply mark as many points as you can find on your carbon paper that are at 9 V, and smoothly connect these points with a line. You've just drawn an equipotential! Make sure to go as far to the left and right of the plates as you can. 10. Using the equipotential lines you’ve drawn, draw the approximate electric field lines in RED. After completing the 5 equipotential lines and the electric field lines, use the WHITE pencil to trace the outline of the aluminum pieces. You can now remove the cables, bars and paper from the board. : 11. Given the voltage difference between the two plates and the separation distance, what is the magnitude of the electric field? — - 30N AE 1 Z2ldn o B T e = 2 Jonemen T 285 W A= \0%wan 2009 RETEo: : A LI T T 12. If we halved the voltage difference across the plates, what could we do (using the same aluminum pieces) to maintain the same charge stored in each plate? :Imwc‘mxge \S_weasured Ay (,Q?o\c\\a*r\ce, K \JO\*aﬂae, \V\ ovc\ev YO howe e SO, Chnovge wivih Noe e yoWwage | fhe (Opacitone sk e doooed. TVne. CopOutance 'S weasoved oS ol /d\ . \n_ocder v \Nowe oL\ Ane Capactonce AN Aotone oy VP Nolwe A Gy we. Equipotentials Page 50f 8

UIC Physics Department Physics 132 Laboratory Experiment Two Concentric Rings Tape down fresh carbon paper and construct the Two Concentric Rings setup shown in “Charge Distribution Layouts.” Note that the red (positive) cable should go to inside ring, while the black (negative) cable should go to the outside ring. This time, measure and draw the equipotential lines for 6V, 10V, 14V, 18V, and 22V using the WHITE pencil. After completing the 5 equipotential lines, trace the outline of the aluminum pieces in WHITE. Then use the equipotential lines to draw the approximate electric field lines using your RED pencil. 13. What is the electric field inside the ceriter ring? How could you verify this experimentally? e elecxric Meld ingide e cenyer fng 15 O becowse e wnole vineg has O consrankt pokxentiol SO-M2@ (s NO Alffecence v poxentiol. ws_ cun o, N@xifa e Q.xve.r‘wv\cr\ko\\\, \""\ Y ejuring e perentio\ oony e wWiole > .. (Lnxer v"\.s-‘:‘fj . \E Yo “;)Cs\fix‘%‘~\f‘\ \S AN Sawe. ”"l\fw"o%\noo* jHoen @ E Hheld =0. 14. Now remove the carbon sheet so that you can make careful measurements. r (cm) V (Volts) Locate and mark the origin as the center of the central ring, and G 6 define rto be the radial distance away from this origin. Find rfor each equipotential line that you drew (you should measure r for 3- 5.1 ' 10 4 points on each line for a more accurate measurement). You should have 5 values for r; one for each line. H .S 14 Fill in the table at right, and make a plot of Potential vs r. For 3,9 18 completeness, fill in the graph for inside and outside the rings. 2.4 \ 22 30 28 26 24 ; \ 22 :_5 20 \\_\ - = X ‘lé 14 LS g1 N g 10 RN 8 < 6 e 4 2 o O S N 3 2 0 1 2 3 4 5 6 7 8 9 10 r (centimeters) Equipotentials page 6 of 8

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version