Careful measurements reveal an electric field where a and R are constants. Which

Question

Careful measurements reveal an electric field where a and R are constants. Which of the following best describes the charge distribution giving rise to this electric field? A negative point charge at the origin with charge q = 4pi epsilon a and a uniformly positive charged spherical shell of radius R with surface charge density sigma = -q/4 pi R2. A positive point charge at the origin with charge q = 4 pi epsilon a and a uniformly negative charged spherical shell of radius R with surface charge density sigma = -q/4pi R2. A positive point charge at the origin with charge q = 4 pi epsilon a and a uniformly negative charged sphere of radius R with charge density p = -q/(4pi R3/3). A negative point charge at the origin with charge -q = -4pi epsilon a and a uniformly positive charged sphere of radius R with charge density rho = q

Explanation / Answer

visit http://ocw.mit.edu/courses/physics/8-02sc-physics-ii-electricity-and-magnetism-fall-2010/gauss-law/MIT8_02SC_challenge_sol05.pdf exactly same problem

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