Potential difference across capacitors

AI Thread Summary
The discussion revolves around calculating the potential difference across a three microfarad capacitor in a circuit where point A is 19 volts higher than point B. According to Kirchhoff's law, the net potential difference around a closed loop must equal zero, leading to a potential difference of -19 volts across the circuit. There is confusion regarding the sign conventions for the batteries and the voltage distribution among capacitors in series, as the total voltage is the sum of the individual voltages across each capacitor. Participants request clarification on the circuit diagram, which is not displaying properly for some users. Understanding the correct voltage distribution and sign conventions is crucial for solving the problem accurately.
Krushnaraj Pandya
Gold Member
Messages
697
Reaction score
73

Homework Statement


The figure shows part of a complete circuit. The potential at point A is greater than that of B by 19 volts what is the potential difference in volts across the three microfarad capacitor?

Homework Equations


All relevant to electric circuits

The Attempt at a Solution


From Kirchhoff's law, net potential difference across a closed loop should be 0. V(a)-(b)=19 V. Therefore, the net potential difference across given figure should be -19 V. I'm having trouble with the sign conventions related to this, since I don't know what sign to put with the batteries, otherwise since all capacitors are in series- charge across them is the same. I'd appreciate some insight.
 
Physics news on Phys.org
Krushnaraj Pandya said:
The figure shows part of a complete circuit.
Which figure?:wink:
 
The voltage would not be equivalent across capacitors in series. The voltage across all of the capacitors is the sum of the voltage across each individual one.
 
Hi could you re-attach the circuit drawing ? It is not displaying on my iPhone
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Sign conventions for Kirchhoff's loop rule
Replies
7
Views
1K
EMF and how it's related to Potential Difference
Replies
1
Views
1K
Calculations involving different Dielectrics and Capacitors
Replies
7
Views
2K
Potential difference between 2 points in a capacitor circuit
Replies
30
Views
3K
Find the maximum potential difference across a series circuit
Replies
11
Views
4K
Circuit with potential difference across battery being zero?
Replies
3
Views
1K
Correct statement about series RC circuit
Replies
4
Views
2K
Potential difference and charge across a capacitor
Replies
2
Views
2K
Comparing energy lost by the battery & energy gained by the capacitor.
Replies
5
Views
2K
Finding charge on a capacitor given potential difference across two points
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top