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PH213_2007FALL_EXAM2__[0]

# PH213_2007FALL_EXAM2__[0] - '07'08 Ph213 Exam 2 Name Slot...

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'07-'08 Ph213 - Exam 2 Name: Slot: * Do all work on the front ofthe attached sheets. Blue books are for scrap onlyl * If you do, e.g., Problem 3 on the Problem 5 answer sheet, change the number up top! 1. Specify any geometrical arrangement (give specific locations) of one proton and two electrons such that the electric potential energy of the system is exactly zero, Explain, in a maximum of 10 words, the meaning of 'zero EPE', How many such arrangements are there with the three particles all on the x-axis? Justify your answer. flO pts] 2. Consider two conce-ntric thin shells. The inner shell is an insulator of radius Rwith net charge Q uniformly distributed on Its outer surface. The outer shell is metallic, of radius 3R, with net charge"Q. By direct integration of the general expression for electric energy density, how much total electric energy is stored in this system? Can you derive this result a different way, using the capacitance of a spherical capacitor: C = ~m:l ?

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PH213_2007FALL_EXAM2__[0] - '07'08 Ph213 Exam 2 Name Slot...

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