# Lab_5 - Physics 272Lab Lab 5 Potential Differences Lab 5...

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Physics 272Lab Lab 5: Potential Differences Lab 5: Potential Difference OBJECTIVES In this lab you will Create a program to graph potential differences Generate a graph of potential difference as a marker moves along various paths Explain qualitatively the graphs you generate Calculating the potential difference along paths near realistic charge distributions is difficult. It is particularly hard if the electric field varies significantly in the region. You will write a VPython program to calculate and display the potential difference as a marker moves along several paths near a charged rod. You will then write brief explanations of the graphs you generated. 1) Warm-Up Problem Problem (1) A long rod of length L carries a uniform charge –Q. Calculate the potential difference V A – V C . All of the distances are small compared to L. Explain your work carefully. CHECKPOINT 1: Ask an instructor to check your work for credit. You may proceed while you wait to be checked off. Uniform charge - Q b a c A B C

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Physics 272Lab Lab 5: Potential Differences 2) Potential Difference: Near a Charged Rod You will use your code from Lab 4 which already contains the code to create a rod. a) Open your code from Lab 4 and save it under a new name so you will still have access to your Lab 4code. Most of the code from Lab 4 is still useful. The modifications to this code are tricky, so be careful. In order to calculate the change in potential over a large path, you will sum up the small changes in potential over short segments of the path. You will treat the electric field as constant over each small interval of the path. You will need to calculate the electric field in that small region. This electric field calculation will involve summing over all the contributions to the electric field that the small charge segments of the rod make. You will need to put the loop which finds the electric field inside another loop which finds the potential.
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## This note was uploaded on 04/23/2011 for the course PHYS 272 taught by Professor K during the Spring '07 term at Purdue.

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Lab_5 - Physics 272Lab Lab 5 Potential Differences Lab 5...

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