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A small Styrofoam bead with a charge of −60.0 nC is at the center of an...

A small Styrofoam bead with a charge of −60.0 nC is at the center of an insulating plastic spherical shell with an inner radius of 20.0 cm and an outer radius of 28.0 cm. The plastic material of the spherical shell is charged, with a uniform volume charge density of −1.85 µC/m3. A proton moves in a circular orbit just outside the spherical shell. What is the speed of the proton (in m/s)?

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