Is it necessary that the plates should have equal and opposite charges always when we charge them with a battery? if yes then why? how do we know that the electrons piling up on one plate will repel exactly the same no. of electrons from the other plate?
No. However, this is the case if we assume the initial condition of each plate is neutral charge. In this case, the battery removes the same number of electrons from the positive plate as it adds to the negative plate. This is how a battery functions.
@@AwestrikeFearofGods but how does a battery 'knows' that it would send and receive the same no. Of electrons at any time? I mean it's just a solution with cathode and anode. Generating potential difference but how it knows it have to maintain that potential difference??suppose we have only one plate connected to positive end of battery and other end is not connected anywhere. We know there would be some positive charges on that plate and wire to cancel the electric field from battery, and these charges itself should come from battery , so battery has indeed recieved some electrons from that plate and wire, without sending any electrons to the other side, shouldn't it change batteries potential difference?
In AC, electrons reciprocate. There is zero net displacement for any integer multiple of the AC period (i.e. inverse of AC frequency). Ex: at 60 Hz, there is zero displacement at 0/60, 1/60, 2/60... seconds. But an electron would be displaced the maximum distance at 0.5/60, 1.5/60, 2.5/60... seconds.
Greetings from Germany! These lectures are great and Prof. Carlson so passionate. What is the book used with this course?
Chabay and Sherwood - "Matter and Interactions"
Is it necessary that the plates should have equal and opposite charges always when we charge them with a battery? if yes then why? how do we know that the electrons piling up on one plate will repel exactly the same no. of electrons from the other plate?
No. However, this is the case if we assume the initial condition of each plate is neutral charge. In this case, the battery removes the same number of electrons from the positive plate as it adds to the negative plate. This is how a battery functions.
@@AwestrikeFearofGods but how does a battery 'knows' that it would send and receive the same no. Of electrons at any time? I mean it's just a solution with cathode and anode. Generating potential difference but how it knows it have to maintain that potential difference??suppose we have only one plate connected to positive end of battery and other end is not connected anywhere. We know there would be some positive charges on that plate and wire to cancel the electric field from battery, and these charges itself should come from battery , so battery has indeed recieved some electrons from that plate and wire, without sending any electrons to the other side, shouldn't it change batteries potential difference?
In the previous lecture, you said electrons never move. But, now you are saying electrons move and pile up.
She never said that electrons never move and I literally just watched the previous lecture
In AC, electrons reciprocate. There is zero net displacement for any integer multiple of the AC period (i.e. inverse of AC frequency).
Ex: at 60 Hz, there is zero displacement at 0/60, 1/60, 2/60... seconds. But an electron would be displaced the maximum distance at 0.5/60, 1.5/60, 2.5/60... seconds.