The region between two concentric spheres of radii ‘a’ and ‘b’, respectively, has volume charge density ρ=A/r, where A is a constant and r is the distance from the centre. At the centre of the spheres is a point charge Q. The value of A such that the electric field in the region between the spheres will be constant, is:
(1) Q/[2π(b2-a2)]
(2) 2Q/[π(b2-a2)]
(3) 2Q/πa2
(4) Q/2πa2
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option 4 is right .......
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answer is the 4 option
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