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Unformatted text preview: electric field at P: Hence ( 29 ( 29 ( 29 1 2 2 2 2 2 2 2 cos cos z k ds k ds z dE dE z R z R z R λ θ = = = + + + ( 29 ( 29 3 3 2 2 2 2 2 2 2 cos R z kz kQz E E dE ds z R z R π = = = = + + ∫ ∫ ( 29 3 2 2 2 z kQz E E z R = = + How does this electric field along the zaxis change with z? What is E at z=0? What is E at z>0? What is E at z<0? What is E at very large values of z? Example 5.1: consider a variation of the previous problem. Shown below is a nonconducting rod that is bent into a halfcircle of radius R. It holds a positive net charge Q that is uniformly distributed over the length of the rod. What is the electric field at P? Will E be zero? Will E x be zero? Will E y be zero? x y Example 5.2: A positive net charge Q is distributed uniformly over the length L of a thin nonconducting rod. What is the electric field E at point P located a perpendicular distance R above the rod’s center? Will E be zero? Will E x be zero? Will E y be zero?...
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This note was uploaded on 04/06/2009 for the course PHYS 0175 taught by Professor Koehler during the Spring '08 term at Pittsburgh.
 Spring '08
 Koehler
 Charge, Work

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