2012 all exam update

# 2012 all exam update - N am e Final Exam A(You m ay x out...

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Name___________ Final Exam A (You may x out one problem for it to not be graded, otherwise, the last problem will not be graded.) Physics 133 Spring 2011 Zammit 1. (10) A metal ball of radius 2.0 m has 3.2 mC of charge. Find the charge density for the ball. Find the electric field everywhere for this system. Find the electric potential everywhere for this system.

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2. (10) Two parallel, square plates are charged, one plus, the other minus, equal and opposite charges. They are separated by 0.30 meters. Draw this below with the positive plate on top. Ignore gravity. The plates are 1.4 meters on an edge. An electron is shot into the space between the plates, halfway between the plates, with a speed of 3.5x10 4 m/ s. The electron passes through the plates, and just barely makes it out without hitting the positive plate. Show this in your diagram below. Find the charge density on the top plate.
3. Short answer: a. (6) Three point charges are arranged in a triangle. The top two charges are 35 C. The bottom charge is - 2 C. The top two are at points (2m, 0) and (0, 3m). The bottom is at (–1m, 0). Draw this below. Find the force on the bottom charge. Draw a diagram to illustrate this setup. b. (4) Given that the potential for a certain set of charges is V(x,y,z) = 3x 2 + 6y 2 - 10 - 5z Find the electric potential and the electric field at the point (2m, 4m, 5m).

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4. a. (5) In the circuit below, the current is 5.5 amps and moving to the left through the resistor which is 22 ohms. Give the changes in the magnet field needed to make this happen. b. (5) For the circuit below, find requested values at the indicated times after the switch is closed. t = 0
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2012 all exam update - N am e Final Exam A(You m ay x out...

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