What must the charge sign and magnitude of a 1.46 g, Ask an Expert

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Q. A uniform spherical shell of mass 9{rm kg} with diameter 54 {rm cm} has four small masses of mass 1.5 {rm kg} attached to its outer surface and equally spaced around it. This combination is spinning about an axis running through the center of sphere and two of the small masses.

Q. What must the charge (sign and magnitude) of a 1.46 g particle be for it to remain stationary while placed in a downward-directed electric field of magnitude 690?

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