A positively charged sphere A is brought close without touching a neutral sphere B. Sphere B is touched with a grounded wire. What is the charge on sphere B after the wire is removed?*1 pointpositivenegativeneutralIt depends on the contact time.
Question
A positively charged sphere A is brought close without touching a neutral sphere B. Sphere B is touched with a grounded wire. What is the charge on sphere B after the wire is removed?*1 pointpositivenegativeneutralIt depends on the contact time.
Solution
The charge on sphere B after the wire is removed would be negative. Here's why:
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When the positively charged sphere A is brought close to the neutral sphere B, it induces a charge separation. The electrons in sphere B are attracted to the side closer to sphere A due to the positive charge.
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When sphere B is touched with a grounded wire, the electrons have a path to move away from the positive charge. This causes the electrons on the side of sphere B closer to sphere A to move through the wire to the ground, leaving the side of sphere B closer to sphere A positively charged.
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When the wire is removed, sphere B is left with an overall negative charge because the electrons cannot return from the ground due to the removal of the wire.
So, the charge on sphere B after the wire is removed is negative.
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