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A uniformly charged spherical shell has inner and outer radii of 25.0 cm and 32.0 cm,...

A uniformly charged spherical shell has inner and outer radii of 25.0 cm and 32.0 cm, respectively. A point charge of −45.0 nC is located at the center of the spherical shell. A proton orbits around this arrangement just outside the spherical shell with a speed of 8.37 ✕ 105 m/s. What is the volume charge density of the spherical shell? (Include the sign of the value in your answer.) µC/m3

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