What happens when a conducting sphere rubs against metal?

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When a conducting sphere rubs against metal, the interaction can lead to a transfer of electrons, but the sphere itself may not retain a fixed charge due to its conductive nature. The metal acts as an electron reservoir, allowing for easy flow of electrons in and out. The discussion raises questions about whether this scenario is part of a homework problem, indicating a need for deeper analysis. Participants are encouraged to share their thoughts on the implications of this interaction. Ultimately, the charge on the conducting sphere is not permanent.
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I know that metal is a "reservoir" of electrons, whereby electrons can flow out and in easily, so when conducting sphere is rubbed against metals, is there even a resulting charge on the conducting sphere?
 
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Is this a homework problem? If so, please give us your thoughts on the matter.
 
kuruman said:
Is this a homework problem? If so, please give us your thoughts on the matter.
I think there will not be a fixed charge on conducting material
 
Thread 'Chain falling out of a horizontal tube onto a table'

Thread 'Chain falling out of a horizontal tube onto a table'

My attempt: Initial total M.E = PE of hanging part + PE of part of chain in the tube. I've considered the table as to be at zero of PE. PE of hanging part = ##\frac{1}{2} \frac{m}{l}gh^{2}##. PE of part in the tube = ##\frac{m}{l}(l - h)gh##. Final ME = ##\frac{1}{2}\frac{m}{l}gh^{2}## + ##\frac{1}{2}\frac{m}{l}hv^{2}##. Since Initial ME = Final ME. Therefore, ##\frac{1}{2}\frac{m}{l}hv^{2}## = ##\frac{m}{l}(l-h)gh##. Solving this gives: ## v = \sqrt{2g(l-h)}##. But the answer in the book...
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