# Questions tagged [capacitance]

The ability of an object to store electric charge.

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### How to apply Gauss's law when dielectric constant in a capacitor varies continuously?

Let's say the problem is to compute the capacitance of a cylindrical capacitor with a dielectric material between the plates. The capacitor is considered to be long enough to ignore end effects. The ...
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### Capacitance of a system of metallic plates

The question states: Four identical metallic plates are arranged in air at the same h from each other. The outer plates are connected by a conductor. The area of each plate is equal to S.Find the ...
386 views

### Different charges of plates of parallel plate capacitor

Suppose the plates of a parallel plate capacitor have charges +2Q and -Q initially. Then if they are connected with a battery of emf V what will be the charge distribution on the plates of capacitor? ...
1k views

### Diode-Resistor-Capacitor Circuit Equations

So I took the time to measure the current dependency on voltage of a diode I have. I applied an exponential fit to it, and have a pretty reliable equation (within 1%). I'm interested in how a diode-...
28 views

### Surface charge on dielectric interface

What I have in mind is a system that consists of a capacitor filled with two dielectric materials, one of them with dielectric constant $\kappa_1$ and the other with $\kappa_2$. The capacitor is ...
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### Resonant Circuits [closed]

So I have this circuit which is resonating, and I want to know how to calculate the output voltage, does anyone have any ideas on how to do this?
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### Magnetic Field in a Leaky Capacitor

Consider a spherical capacitor which is made of two concentric spherical shells. The capacitor is charged so that outer shell carries a positive charge and the inner shell carries a negative charge of ...
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### How is dielectric constant both $E_{net}/E_o$ and $ε/ε_o$?

The questions asks that, given the (surface) charge density (σ) on the plates of a parallel plate capacitor and dielectric constant (k), what would be the magnitude of induced charge density on the ...
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### Grounded/Earthed electric circuits

I have a problem here that involves a circuit that is grounded at the point shown at the bottom the circuit. The units marked with C are all capacitors and Uv is a voltmeter. I haven't seen any ...
256 views

### Gain as a Function of Frequency (RC High Pass Filters)

I configured a simple series RC circuit. Across the circuit I have placed the terminals of a sinusoidal AC voltage source (I'm using my phone as a function generator). My goal has been to measure the ...
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### The volume enclosing the charge in Gauss's law: does it have to be simply connected?

I was trying to apply Gauss's law to a simple problem: Find the capacitance of a cylindrical capacitor. Inner radius is $a$ and outer radius is $c$. The space between the plates is a dielectric ...
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### I have derived that the impedance of a capacitor varies with time

For a closed electrical circuit comprising only an alternating current generator and a capacitor, I have derived that the ratio voltage/current of a capacitor is not constant. As Wikipedia defines it, ...
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### Conceptual understanding of how a battery ensures that a capacitor has the same potential difference as it?

I was wondering how exactly a battery is able to ensure that a capacitor connected to it would have the same potential difference as it. Like, thinking about a battery similarly to a capacitor, I ...
378 views

### Earthing a system of parallel plates

our sir has taught us that when in a system of conducting infinite plates kept parallel to each other, when any one of them is earthed, then the charges present on the free ends(i.e. the open sides of ...
169 views

### How Are Electromagnetic Waves Produced?

How EM waves are produced say by a capacitor of an LC circuit here if $E$ is increasing in upward direction? My thoughts Thought 1:- If E is increasing E flux is increasing thus B field must be ...
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### Sizing capacitor and power factor

The first formula is the reactance that you need to improve your PF to your desire (). The second formula given is use to calculate the capacitor needed to get the desired reactance (QVAR) I am ...
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### In a free underdamped RLC circuit, when the current is maximal, is the voltage in the capacitor zero?

I am in my last year of high school. We are studying free RLC circuits but we're not diving too deep into the theory. We know how to derive the differential equations governing charge, current and ...
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### What is an isolated system in capacitive circuit?

Does isolated system here means that the plates of capacitor need not be connected to terminals of a battery?
220 views

### Cylindrical capacitor, why is the electric field radial between the two plates?

I'm trying to understand why if I consider a cylindrical capacitor whose height is $h$, the radii are $R_1$ (external) and $R_1$ (internal) and I put myself between the two plates I can say that the ...
508 views

### What is capacitance, in general?

In circuit analysis software capacitance can be measured between any two nodes of a circuit or of a multiterminal device. In practical terms we take $C_{ij}$, the capacitance between $i$ and $j$ as ...
52 views

### Charging of a capacitor by battery

I know that a battery does work when it takes positive charge from one plate of capacitor and deposits it to the other plate, thereby creating equal and oppositely charged plates having electric field ...
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### How do measure the potential gradient between large capacitor plates?

I have built a capacitor for a biology experiment, but I need to measure the potential gradient between the plates. Mainly I am going to apply an AC current between the capacitor plates to have an ...
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### Pressure increment in the gap between two parallel plate capacitors

What is the pressure increment in the gap between two parallel plate capacitors when they are immersed in water horizontally with a constant voltage of 500? Take dielectric constant = 81, distance ...
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### Does sputtering Au on top of PEDOT:PSS thin film alter its properties?

I have grown thin films (~100-500 nm) of PEDOT:PSS by electrodeposition on top of thin films of Au (~1 nm) and now I want to measure the impedance of the PEDOT:PSS thin film. To accomplish this I am ...