Positively charged rod to an uncharged electroscope

AI Thread Summary
Bringing a positively charged rod near an uncharged electroscope causes the leaves to diverge due to charge separation. Negative charges within the electroscope are attracted to the positively charged rod, while positive charges are repelled, leading to a concentration of negative charges near the knob. This movement occurs because electrons, which are free to move in the conductor, respond to the external electric field created by the rod. The fixed positive charges in the metal lattice do not move, reinforcing the separation of charges. Thus, the divergence of the leaves is primarily due to the repulsion of positive charges and the attraction of negative charges.
PhysKid24
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Hi I was just wondering what the answer to the following question would be:

If you bring a positively charged rod to an uncharged electroscope causing the vanes or leaves inside to diverge, are negative charges attracted to the knob of the electroscope or do positive charges repel to the vanes of the electroscope? I think it's the latter, but not sure why it also couldn't be the first.
 
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In the electroscope, which is a solid conductor, only the negative charges (electrons) are free to move. The positive charges (protons in the metal atoms) are fixed in a lattice structure (the metal atoms are not free to move).
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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