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$47. space Three space concentric space conducting space spherical space shells space of space radii space straight R comma space 2 straight R space and space 3 straight R space carry space charges space straight Q comma space minus 2 straight Q space and space 3 straight Q space respectively. left parenthesis straight c right parenthesis space Compute space the space total space electrostatic space energy space stored space in space the space sstem. The space inner space shell space is space now space connected space to space the space external space one space by space straight a space conductig space wire comma space passing space through space straight a space very space small space hole space in space the space middle space shell. left parenthesis straight d right parenthesis space Compute space the space potential space at space straight r equals straight R comma space and space the space charges space on space the space spheres space of space radii space straight R space and space 3 straight R$

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