All Questions
23
questions
1
vote
3
answers
446
views
Is it necessary that a capacitor stores energy but not charge?
Is it necessary that a capacitor stores charge? The definition of capacitor given in books is that it store electric energy. So is it possible that the capacitor does not store charge but stores ...
- 1
0
votes
1
answer
77
views
Why does the current flow through a wire if the wire is an equipotential surface? [duplicate]
From what I know, current flows across two points only if there is some potential difference across those two points. If that is the case, why does the current flow through a wire then?
See the ...
- 9,500
0
votes
2
answers
57
views
Current in a two capacitors system in parrallel
I solved this question and I got the values of charges on capacitors in figure B. But my question is charge on capacitors is getting redistributed,but how is it possible when potential difference ...
- 36.1k
0
votes
3
answers
119
views
Why won't the bulb light? [closed]
Here's what the marking scheme says: "Capacitor gets charged first and acts as an insulator/blocks current".
However, electrons flow from negative to positive, so shouldn't the electrons ...
- 15.2k
0
votes
0
answers
63
views
Charging a single plate of a capacitor does not work
I charged a 100nF capacitor with 12V with a battery, then i disconnect the battery from the capacitor and connect the positive side of the capacitor to ground (which is an electron source) ...
- 35
1
vote
1
answer
279
views
How do you set up Kirchhoff's loop rule for a circuit with a charged capacitor, uncharged capacitor, and resistor?
If I connect a circuit with charged capacitor that has charge $q$ to an uncharged capacitor and resistor, how would I set up a differential equation that can be used to find the time constant? I know ...
- 2,680
0
votes
2
answers
119
views
Can current flow through a capacitor submerged in electrolytes?
Imagine two flat conducting plates (3 x 3), one as the anode and the other as the cathode, submerged into electrolytes (e.g. sea water) and a DC current is applied to this apparatus. Could current ...
- 861
2
votes
4
answers
14k
views
Is there a physical explanation for why increasing a capacitor's capacitance and the circuit's resistance decrease the capacitor's rate of discharge?
The voltage across a capacitor as a function of time is given by:
$$V=V_ie^{-t/RC}$$
Therefore, increasing the resistance and capacitance increases the time it takes for the initial voltage to drop ...
- 101
0
votes
0
answers
41
views
How to use energy conservation in following case [duplicate]
A capacitor of capacitance C is intially uncharged is connected with a battery of emf ε.Find the heat dissipated in the circuit during charging?How can we apply energy conservation although there are ...
- 73.7k
0
votes
4
answers
8k
views
Why do Capacitors discharge?
I understand how capacitors charge and i know they discharge but i am so confused why they discharge. How do they suddenly know when they are full to discharge. I am doing a school report and really ...
- 17.2k
2
votes
2
answers
168
views
Touching single line of AC Power and charge oscillation in body
If a person touches a single line of AC(Only on the live line, and no where else. Say he/she is hanging on the power line using one hand) as shown in the attached image, Do the ions in his/her body ...
- 1,617
1
vote
2
answers
117
views
Why do generators need a complete circuit to move electrons but capacitors do not?
A charged capacitor will shock you if you come too close to it or touch it, and you are connected to the ground. A generator will only generate electricity if it has a complete circuit, it cannot just ...
- 110
0
votes
1
answer
5k
views
How does a bulb light up when it's connected in a circuit with an uncharged capacitor and a cell?
Since there is a capacitor, isn't it an incomplete circuit? How does the current flow across the dielectric medium? If a bulb was connected to a cell alone and if there was a break in the wires of the ...
- 1
1
vote
2
answers
4k
views
Charge flowing through switch when it is closed [closed]
The problem that I'm having is that the initial charges would have been 300 and 600 microcoulomb on the 3 and 6 microfarad capacitors respectively. But when the switch is closed there's some charge ...
- 36.1k
2
votes
2
answers
679
views
Discharging a capacitor
Suppose I have a charged capacitor, meaning there's a voltage (electric potential difference), say, $2V$, between its two plates. We don't know the electirc potential of the individual plates, right? ...
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