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You bring a negatively-charged glass rod close to (but without touching) a neutral metal sphere that...

You bring a negatively-charged glass rod close to (but without touching) a neutral metal sphere that is connected to ground by a wire. After waiting a few seconds, the wire is broken (without touching the sphere), and after that the rod is also removed. The shpere is now

a. neutral b. positively charged c. negatively charged

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