All Questions
Tagged with voltage capacitance
229
questions
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A capacitor partially filled with dielectric [closed]
Assume a parallel plate capacitor that was charged up to $Q_0$ from a source $U_0$ and then disconnected from the voltage source. The plates have an area $A$ and the distance between the plates is $d$....
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49
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Maxwell stress tensor on a capacitor late given a dielectric
Given a capacitor with large plates (area $A$) separated by a dielectric with relative permittivity $\varepsilon_r$ and thickness $g$, I believe the Maxwell stress tensor states that the force on each ...
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Equivalent capacitance for a system of spherical capacitors
The question demands equivalent capacitance of two concentric metallic shells with larger and smaller radii. b and a respectively. The inner sphere is just left open(it's not earthed or anything), and ...
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Maximum voltage that a system of two capacitor withstands when connected in series [closed]
Question:
A capacitor of capacitance 1 micro faraday withstands the maximum voltage 6kV while a capacitor of 2 micro faraday withstands the maximum voltage 4kV. What maximum voltage will the system ...
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Capacitors with same capacitance but different voltage ratings
Suppose we have two capacitors that have same capacitance (same dielectric material) but different voltage ratings. Let both capacitors each be fully charged to their maximum voltages. From formula $Q=...
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Behaviour of current in Pure capacitive circuit with DC voltage across
A circuit has just 1 capacitor and a DC Battery (V volts) and the wire has no resistance. At time $t=0$ the capacitor is completely uncharged. How current in this circuit changes with time?
What i ...
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174
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Why does the capacitance of a capacitor depend on charge and potential?
The formula of capacitance is
$$C = \frac{Q}{V}.$$
So the capacitance of a capacitor should depend on the charge and potential but it doesn't. Why?
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Why is the electric field strength ($V/d$) constant in a charging capacitor?
The electric field strength at a point in a charging capacitor $=V/d$, and is the force that a charge would experience at a point. This doesn't seem to make sense, as all the capacitor is is 2 plates,...
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Discharge of a capacitor with variable backvoltage?
I understand that the voltage of a capacitor as it discharges overtime is $$V(t)=V_0e^(-t/RC).$$
I've also heard people say things like "voltage is relative. The voltage to the ground or the ...
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1
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83
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What is the electric potential difference for two spheres capacitors connected in series [closed]
Consider two spherical capacitors with Identical radii for the inner and outer spheres (let them be a and b). +q and -q charges are in the inner and outer sphere on Both the capacitors. Now I connect ...
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Basics of Capacitor
Looking at the formula $C = \frac{Q}{U}$ does a high capacitance mean that with a low voltage we can bring more charge onto the capacitor? How is total charge on the capacitor linked with voltage?
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Decreasing of a charge amount and its effects on a capacitor
There is an equation of charge amount on a capacitor you may know;
This graph above shows the charge amount. And according to the book "Fundamentals of Electric Circuit from CK Alexander", ...
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45
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Voltage Difference Across Capacitor Plates
If a parallel plate capacitor is connected to a 9V battery, what is the electric potential difference between the two plates? Is it 18V since the positive plate will have an electric potential of 9V ...
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33
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Determining if a capacitor will charge or discharge based on voltage [closed]
The question also says that the voltage of the battery is 12 V. We're supposed to determine if the capacitor is charging or discharging or neither. I'm just not sure how to use the voltages given to ...
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3
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Why does the capacitance of a parallel plate capacitor increase on filling it with an insulating dielectric if the voltage is fixed?
In the case that the electric field $\textbf{E}_0$ is confined to the space between the plates of an isolated and charged parallel-plate capacitor, an inserted linear dielectric that fills the space ...
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