Exam3 - Principles of Physics II PHYS 2212-160 Exam#3 Fall...

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Principles of Physics II PHYS 2212-160 Exam #3 Fall 2010 Name__ ________________ You may use the values k = 8.99x10 9 N m 2 /C 2 , ε o = 8.85x10 -12 C 2 /Nm 2 , μ o = 4 π x10 -7 N/A 2 , and e = 1.60x10 -19 C. You must show all of your work for full credit. 1. (15 points) A length of wire carries a current of 3.50A to the right along the x-axis and extends from the origin to the point x = 25.0cm . What is the magnetic field vector at the point (x, y) = (5.00cm, 5.00cm)? 2. (15 points) A parallel-plate capacitor in air has circular plates of radius 3.5cm separated by 2.0mm . Charge is flowing onto the upper plate and off the lower plate at a rate of 7.5A . a) Find the electric field between the plates as a function of time (assume Q = 0 at t = 0) . b) Using your electric field from part a) show the displacement current between the plates is 7.5A .
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3. (20 points) A uniform magnetic field of magnitude 2.35T is in the positive y-direction. Find the force on a proton if its velocity is a) = 1.4Mm/s , b) = 1.7Mm/s , c) = 3.4Mm/s , and d) = 3.0Mm/s - 4.0mM/s . (If is to the right and is up the page, would be out of the page.) 4. (20 points) A uniform 8.75T magnetic field points out of the page as shown below. A
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