PHYS 102 - Spring 2021-22 Lab 2 Worksheet File Submission (Filenames) Worksheet = Phys102_Lab1_LastName Plots - Phys 102_Lab1 Graph_LastName File Submission: Huynh Mai, Dallas Hallston Data Analysis (Attach a completed Excel spreadsheet from your data analysis and show your work.) Plot F vs. AV2 2 D2 for the two plate separation distances provided for analysis on one chart. Attach the plots as a separate file (make the file name "Phys102_Lab1_Graph_LastName", inserting your last name). (60 points) Carry out the analysis described in section 5 of the lab manual to make an experimental prediction for ¿o and write it in the space below. Be sure your calculation has appropriate units and significant figures. 80 = - 1 E-12 Assuming &air ~ €, how accurate is the experimental result? Support your answer by finding the percent error between the experimental result and the known value. (10 points) Our data shows that, while our data is somewhat precise, it also resulted in a negative overall Observed Value, suggesting that our positive and negative terminals have been switched during the experiment. To mitigate this mishap, we will calculate our Percent Error using a positive counterpart of our Observed Value: % Error = = 1*10-12-8.85*10-12 =88.7% Actual Value Observed Value - Actual Value 8.85*10-12 This shows that our result is relatively accurate given the circumstances. How precise is your experimental result? Support your answer by reporting the R-squared values from the linear fits. Our data is considerably precise, with most graphs' R-squared values ranging from 0.91 to 0.99, with a couple outliers which stood at 0.19 and 0.83.
What experimental uncertainties might contribute to errors in the measurements? Propose one or two origins of uncertainty. The known errors in our data, that being the negative Observed Value and the outliers in the R-squared values, are most likely caused by inaccurate measuring procedures. The cause for the negative Observed Value is possibly due to the wrongly connected terminals. With the outliers in our R-squared values, we suspect that it could have been caused by the scale we used which we had difficulty zeroing during the experiment. This caused us to record possibly faulty data, altering the preciseness of our data.
Extra Credit Dielectrics In the force measurements, the plates were separated by air. When a dielectric is placed between the plates at constant potential difference (voltage), does the force increase, decrease, or stay the same? Briefly provide a reason for the observation. When a dielectric plate is placed in-between the plates, the force increases. The dielectric increases because of the increase in the value 'k' or the dielectric constant, when more plastic is added in between. When C = (Ac, k)/d increases it also increases the force Fringing fields From Figure A, estimate how far from the edge that electric field distortions begin to be observed. From figure A if we assume each arrow, it about 1cm apart, only the last centimeter is being affected by the edge of the plate at most. For the dimensions