# Questions tagged [capacitance]

The ability of an object to store electric charge.

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### 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) ...
19 views

### Relation between initial current and current amplitude in $RLC$ circuits

Let $\phi$ be the so called phase-angle, which measures how much the voltage $V(t)$ leads the current $i(t)$ in a $RLC$ circuit. How would you justify the relation $$i(t=0)=i_m\cos\phi$$ where $i_m$ ...
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### How come the filled water bottle work as a stylus for phone but not the empty bottle?

Take an empty plastic bottle, and make it slide on a mobile screen. You would find that it's not doing anything. Now filled up this bottle with water and try doing the same. This time you will find ...
411 views

### How does current flow in a circuit with a capacitor?

When a capacitor is connected to a battery, current starts flowing in a circuit which charges the capacitor until the voltage between plates becomes equal to the voltage of the battery. Since between ...
35 views

### Energy loss due to changing capacitance [closed]

I was able to solve first two parts of the question. But after solving third part (energy loss to be precise), I felt conflicted. I calculated that Uinitial = 0.0162 J and Ufinal = 0.0162 J So then ...
44 views

### I am confused on how to think about potential energy stored in capacitors [duplicate]

Energy stored in capacitors is represented by $$U = \frac{1}{2} QV$$ Now I have heard 2 reasons why there’s a half factor, unlike the general potential energy equation, which is $U = QV$. Capacitors ...
18 views

### Capacitive circuits with two or more potential differences

Just I was curious on this question that I like very much. Here I add my image create with my fingers. Recently I have been looking at the Physics textbooks that I have, including that of the ...
24 views

### How to identify series and parallel connections of capacitors in complex circuits? [closed]

Like for this question (picture attached) how to identify if capacitors are in series or in parallel?
42 views

### Does energy of a capacitor means energy stored in both plates?

I've a doubt in this, Does the term potential energy of a parallel plate capacitor means the energy stored in both the plates or a single plate, since the formula $E=Q^2/2C$ , $Q$ is the charge of ...
32 views

### If there's a capacitor fully charged and the other isn't fully charged a and they are in parallel are the tension in the two capacitors equal? [closed]

V is the final tension of the second capacitor, but the other one isn't fully charged and both of them are in parallel, are the tension of the two capacitors equal?
21 views

### What is the Initial tension in a equivalent capacitor? [closed]

In the equivalent capacitor of this association, what's the initial tension of the equivalent capacitor? $V_0$ is the initial tension.
23 views

### Work done on a charge inside a homogeneous electric field and changes in Energy of the system

How to understand the concept of work using the following example: a positively charged particle (with charge $Q$) is placed in between a charged in a homogeneous electric field between the capacitor ...
45 views

### Does work done in a capacitor in moving a charge or increasing potential difference always twice the potential energy stored?

On doing calculations like this: Work done in moving a charge across a potential difference = $(CV)V$ = $CV^2$ Potential energy increased = $(1/2)CV^2$ From this work done is twice the potential ...