An insulating sphere of radius R = 0.160 m has uniform charge density ρ = +7.20 × 10−9 C/m3. A small object that can be treated as a point charge is released from rest just outside the surface of the sphere. The small object has positive charge q = 3.40 × 10–6 C. How much work does the electric field of the sphere do oil the object as the object moves to a point very far from the sphere?
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