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Unformatted text preview: EE1 Spring 2008 Homework #5 Solutions (1) (a) Find the electric field E on the zaxis for z = h > 0 ? The system above can be represented by removing the conductor and replacing it with an negative line charge density of the same radius at z =2d. To calculate the electric field for the region z = h > 0 we must add the contribution from each ring of charge. The electric field for a circle of charge on the zaxis is given by (derived from HW #2): E = ρ l az 2 ( a 2 + z 2 ) 3 / 2 ˆ z For each ring of charge the electric field is: E 1 = ρ l az 2 ( a 2 + z 2 ) 3 / 2 ˆ z 1 E 2 = ρ l az 2 ( a 2 + ( z + 2 d ) 2 ) 3 / 2 ˆ z The electric field is then the sum of the two field at z=h: E tot = E 1 ( h ) + E 2 ( h ) E tot = ρ l ah 2 ( a 2 + h 2 ) 3 / 2 ˆ z ρ l az 2 ( a 2 + ( h + 2 d ) 2 ) 3 / 2 ˆ z (b) Find the electric field ( E ) on the zaxis for z = k where k > d Since this is inside the conductor, E = 0. 2 (2) Find the capacitance of an isolated conducting sphere of radius b that is uniformly coated with a dielectric layer of thickness d . The dielectric has an electric susceptibility of χ e We can calculate the capacitance by using the boundary condition: D 1 = D 2 , where 1 is the dielectric shell region and 2 is the freespace region outside...
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This note was uploaded on 06/18/2008 for the course EE 1 taught by Professor Joshi during the Spring '08 term at UCLA.
 Spring '08
 Joshi

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