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Three concentric spherical conductive shells of radii 5 cm, 10 cm, and 15 cm are charged...

Three concentric spherical conductive shells of radii 5 cm, 10 cm, and 15 cm are charged with 9 μC, 15 μC, and -23 μC, respectively. What is the electric field at r=2.5 cm, r=12 cm, and r=20 cm?
E1=___V/m
E2=___V/m
E3=___V/m
What are the electric potentials at these points?
V1=_____
V2=_____
V3=_____

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