Why is Sphere B Negatively Charged? Physics Explanation

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Sphere A, carrying a net positive charge, induces a negative charge on sphere B, which is initially neutral, when they are placed near each other. Grounding sphere B allows electrons to flow from the earth into sphere B, neutralizing its charge and resulting in a net negative charge. The positive charge of sphere A attracts electrons from the ground to sphere B, rather than allowing any charge to flow from sphere A. This process explains why sphere B becomes negatively charged instead of remaining neutral or becoming positively charged. The interaction demonstrates the principles of electrostatics and grounding in physics.
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Sphere A carries a net positive charge, and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded. Why is Sphere B now negatively charged? I mean, why isn't it positively charged (which I though was the answer) or neutral? Is it the flow of electrons from A to B?

Thanks.
 
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There is no way for charge to flow off sphere A. Grounding sphere B just allows charge to flow onto it from some unlimited source (the earth) until it is at 0 volts. In this case, the positive sphere pulls negative charge up from the ground onto sphere B.
 
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