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 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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