# Recent content by mhrob24

1. ### Differences in the Brightness of bulbs for 2 separate circuits

I came across 2 similar example problems while studying for my exam and I want to make sure I get the differences between the two before I take my test later this evening. (This might be long but I have an exam coming up and I don't want to go into it with any uncertainties. I appreciate anyone...
2. ### Find unknown values of current in multi-loop circuit

Thank you SO much for clearing that up, honestly. I spent hours trying to figure out how it could be correct. That final equation for the right loop is what was confusing me. Her initial equation for the right loop is : -i2R2 + V2 - i3R3 and the sign of the V2 is what was confusing me. It...
3. ### Find unknown values of current in multi-loop circuit

So I'm going over my review questions/notes provided by my professor for the upcoming exam on Tuesday, and I came across an example problem that I THINK might be a typo, but I want to make sure I'm right. I'm not sure why the potential drop when crossing V2 is ADDED to the loop equation for...
4. ### Find the maximum potential difference across a series circuit

Hey, hope you’re still with me. I’ve been dealing with a cold so I got some early sleep yesterday. I know the charge on each of the plates can’t be any greater than 1.25e-3 because capacitor C1 has a capacitance of 10.0e-6. Dividing this from Q will give us 125V ( V = Q/C) for that capacitor...
5. ### Find the maximum potential difference across a series circuit

That all the capacitors in the series will have the same magnitude charge on each of their plates. So initially, they will all have zero charge, and then will have charge Q on each plate. (+Q and -Q)
6. ### Find the maximum potential difference across a series circuit

Yeah sorry about that. The online HW site im using (Webassign) has a reputation around here of being notoriously terrible with the questions they ask, so thanks for sticking with me still. Well, to start, I guess If the max V that any single capacitor here can have is 125V, that must mean the...
7. ### Find the maximum potential difference across a series circuit

From your previous response, if the maximum V that any of the 3 capacitors can have in this circuit is 125V, and this is a series, then the sum of the voltages across each capacitor will add up to the total supply voltage of the circuit? That would mean 125 * 3 = 375V for the maximum voltage...
8. ### Find the maximum potential difference across a series circuit

I'm somewhat familiar with Kirchhoff's rules but only because I just googled it. This question came from an online HW platform and each set of questions are based off a specific chapter. In this case, its chapter 8 (capacitors) for me. Kirchhoff's rules aren't discussed until chapter 10, so this...
9. ### Find the maximum potential difference across a series circuit

I'm not really sure what I need to find exactly. From what I'm seeing, I could give C1 the max potential difference of 125V because it has the lowest capacitance, and because V = Q/C, this means the capacitor with the highest potential difference across its plates will be the one with the lowest...
10. ### Find the charge on the plates of a parallel-plate capacitor w/ dielectric

Yes, I think I see what you mean. I did get the correct answer (2.1e-7), but I want to make sure I know why I got the wrong answer at first So excluding the fact that we have a dielectric : C = ε0 * (a/d) = 7.72e-14 V = E*D = 893750 J/C Now solve for Q, where Q = C*V, but enter the...
11. ### Find the charge on the plates of a parallel-plate capacitor w/ dielectric

This is an online HW question so maybe my digits are just off from rounding or something, but I don't know why I am not finding the correct answer. I got Q = 6.9e-8 as the magnitude of charge on each plate. I basically just needed to calculate the original capacitance of this capacitor using c...
12. ### I Prove to me how capacitors in parallel can have the same V across plates

Ok, let me see if I've got this correct. So, E ∝ Q. However, Q doesn't reach the plates without the V from the battery moving it. So I can see how the poster before you is correct by saying that the E field depends on the V, not the other way around. So, basically, this is saying E ∝ V. If you...
13. ### I Prove to me how capacitors in parallel can have the same V across plates

The only way I can kind of see how it makes sense is if you use V = Q/C and plug in Q*d/ε0*a for V. Then you get: Q*D/ε0*a = Q/C. Then, the charge Q cancels so V wont depend on the electric field or the charge Q on the capacitor plates.....but this just goes against everything I learned...
14. ### I Prove to me how capacitors in parallel can have the same V across plates

*If at any point I say something incorrect or its clear I don't have the right understanding of something, please point it out and correct me. I need to be sure I'm understanding it all correctly. So please don't answer unless you're willing to read this entire post* So I know capacitors in...
15. ### Find the E-Field between plates when given only given part of the total voltage

Lmao I really hope so.... So basically the electric potential difference does not depend on the charge moving withing the field between the plates. It only depends on the distance between two separate points within the electric field. So basically, its the electric potential energy difference...