# Questions tagged [capacitance]

The ability of an object to store electric charge.

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### Determining the relationship between plate separation distance and capacitance experimentally

On a lab I recently did, I measured the capacitance between aluminium foils over a range of distances. One of the subsequent questions was to determine the function that best describes the ...
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### Charge stored in a capacitor with dielectric when relative permittivity varies

Suppose the relative permittivity of the dielectric in an uncharged capacitor of capacitance C varies with the voltage applied, e.g. k=xV where x has dimensions of V^-1 (After this capacitor is given ...
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### Paradox on setting up charges on capacitors

Staring with facts, 1)For a current to flow there must be a closed loop. 2)For a capacitor to be charged there must be a potential difference across it, 3)And obviously a charge must be transferred ...
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### Potential and work across capacitor-battery circuit

Suppose, we have a simple capacitor/battery setup like that shown below. The battery is used to charge up the capacitor. After the capacitor is charged, there will be equilibrium, the field of the ...
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### Why does the charge required on each plate of a capacitor to maintain a certain voltage decrease with the distance between the plates?

The $Q$ charge and the voltage $V$ of a capacitor are linked by $$Q=C\times V$$ For a parallel plate capacitor $C\propto \frac{1}{d}$. This implies for a given voltage $V$ between the plates, the ...
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### Why is the information of a time delay missing in formulae of voltage drop across elements when we emulate DC with an AC voltage supply?

In an AC circuit, the reactance of capacitive and inductive elements are determined by the frequency of the AC signal. When we try to emulate DC analysis by putting $\omega$ = 0 , the capacitive ...
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### Insertion of current carrying metal sheet between the plates of parallel plate capacitor

A parallel plate capacitor with area of plates A and distance between them d is charged with Voltage V1. A metal sheet carrying current is inserted between the sheets. How does the system change? What'...
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### How can a conductor plate stay neutral when we force it to be charged?

At the beginning of this video "Capacitors and Capacitance: Capacitor physics and circuit operation" Let say, blue particles be negative charges. In the video, it is claimed that If we push electrons ...
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### RC constant in a coaxial cable

i have a problem with understanding a certain aspect of calculating the RC constant in a coaxial cable. Given the reistance in the inner wire, and the outer wire, and given the capacitance. These ...
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### Current in a RC circuit

In order to find current in an RC circuit, resistance of only the resistor is considered i.e. $I_\text{resistor} = V_\text{resistor} / R$. Why is the reactance of the capacitor not considered? The ...
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### Partial discharge of capacitors - can it be engineered to give a desired, continuous output?

Don't know anything about physics. I expect to be ignored or told to go somewhere else. My question is on converting energy stored in a capacitor by engineering controlled partial discharge (leakage,...
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