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Physics 1AA3 Lab Report Template Experiment 3: Dipole Electric Potential Name: Student number: Partner names & student no.: Please fill out your name and student number and then your partner’s name & student numbers above. Use this template to record your answers to the questions for the manual, copy in sample calculations and figures, and complete the lab exercise.

Question 1 (abbreviated) (1.0 mark) What is your hypothesis? Report of placement/length uncertainty (with proper sig. figs.): (0.25 marks)

Sample calculation for d (Note: you only need to calculate the value for d , take the uncertainty as the placement uncertainty from Table 1. Make sure to report with the uncertainty and proper sig. figs. at the end.) (0.5 marks)

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Question 2: (0.5 marks) Are there some parts of the graph of V m vs. 1 / r 2 where the data follow a linear trend but other parts where they do not? Make an estimate for which values of 1 / r 2 (approximately) is the curve straight or not. Use the linear fit line from Capstone to guide your answer. Sample calculation for the linear fit slope and y-intercept uncertainties: (0.75 marks) Report of the linear fit equation: (0.25 marks)

Question 3: (1.0 marks) Do the slope and y-intercept agree with the theoretical predictions from your hypothesis? Note, the charges in the simulation have magnitude |q| = 1 nC, and all distances are already measured in metres. Question 4 (0.5 marks) For the smallest radius you measured, how much larger or smaller is the potential from Equation 3, V c , than your measured potential, V m ? How much larger or smaller is that radius, r , than the separation between the charges, d ? (Simply report the numbers). Remember to include the uncertainties with proper significant figures.

Question 5 (0.75 marks) What happens to the value of Vc/Vm as r/d increases? Report your values of Vc/Vm and r/d where Vc/Vm approximately reaches a constant value (i.e. roughly constant with respect to uncertainties). What is the significance of this constant value? What does it imply for how well Equation 3 describes the dipole potential? Question 6 (0.5 marks) For the smaller radius you measured (in the θ = 45° configuration), how much larger or smaller is the potential from Equation 3, Vc, than your measured potential, Vm? How much larger or smaller is that radius, r, than the separation between the charges, d? (Simply report the numbers.) Remember to include the uncertainties with proper significant figures.

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Question 7 (0.5 marks) Consider your answers to Questions 4 and 6. In these instances, does Equation 3 overestimate or underestimate the measured potential? Is this conclusion the same for the θ = 0° and θ = 45° cases?

Question 8 (0.75 marks) For the larger radius you measured (in the θ = 45° configuration), what is the value of Vc/Vm (with uncertainty)? Compare this result with your observations from Question 5. In 2-3 sentences, based on your data, discuss whether the approximation from Equation 3 is still accurate even when the potential is measured at varying angles to the dipole moment. Digital Submission (2.75 marks): Figure 1 (0.5 marks), Figure 2 (0.75 marks), Figure 3 (0.5 marks), Figure 4 (0.5 marks) Capstone workbook completion (0.5 marks)

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