HW-3 - HW-3 1 Find the electric field a distance z above...

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HW-3 1. Find the electric field a distance z above the center of circular disk of radius R which carries a uniform surface charge density . What does your formula give in the limit R and z R  . 2. Suppose the electric field in some region is found to be r kr E 3 , in spherical coordinates (k is some constant). (a) Find the charge density . (b) Find the total charge contained in a sphere of radius R, centered at the origin. 3. Find the electric field inside a sphere which carries a charge density proportional to the distance from the origin,
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