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Four concentric spherical conductive shells of radii 5 cm, 10 cm, 15 cm, and 20 cm...

Four concentric spherical conductive shells of radii 5 cm, 10 cm, 15 cm, and 20 cm are charged with 4 μC, 7 μC, -15 μC, and -5 μC, respectively. What is the electric field at r=3.5 cm, r=16 cm, and r=25 cm?
E1=_________V/m
E2=_________V/m
E3=_________V/m
What are the electric potentials at these points?
V1=__________V
V2=__________V
V3=__________V

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