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Unformatted text preview: 2 2 Two Wires d dλ λ x y Figure 2: 2 uniformly charged wires atd and d Suppose there is uniformly charged inifinitely long wire at x =d and x = d as shown in Figure. Wire at x =d has uniform charge densityλ , and wire at x = d has uniform charge density λ . a) Find electric field on x,y,zaxis (zaxis is coming out of paper). b) How much work does it take per length of wire to move negatively charged wire to x =2 d and positively charged wire to x = 2 d ? 3 3 Floating Mass g M R H z y x Q Figure 3: Object with mass M with charge Q at height H above a disk with charge density σ = ar 2 A disk with radius R and charge density σ = ar 2 is located on xy plane as shown. I want to place an object with mass M and charge Q somewhere on zaxis such that it floats. Assume force of gavity is pointing inˆ z direction with magnitude Mg , find H . You don’t have to do nasty algebra at the end. Set up and equation to solve H . 4...
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This note was uploaded on 02/04/2010 for the course PHYSICS 7B taught by Professor Packard during the Spring '08 term at Berkeley.
 Spring '08
 Packard

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