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three concentric spherical conductive shells of radii 5cm, 10cm, and 15cm are charged with 4 uC,...

three concentric spherical conductive shells of radii 5cm, 10cm, and 15cm are charged with 4 uC, 5 uC, and -9 uC respectively, what is the electric field at r=2.5cm, r=12cm, and r=20cm?

what are the electic potentials at these points?
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