Two conductive spheres are placed near (but not touching) each other on an insulated table. Sphere A carries a net negative charge, while sphere B is neutral. Sphere B is briefly touched with a wire that is grounded. Sphere B

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When sphere B is grounded while near a negatively charged sphere A, electrons from sphere B are drawn to the ground due to the repulsion from the excess electrons on sphere A. This leaves sphere B with a net positive charge.

Two Conductive Spheres Are Placed near (But Not Touching) Each