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What happens when a charged capacitor is connected across an uncharged one?
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∙ 10y ago
When a charged capacitor is connected to an uncharged capacitor charge flows from the charged to the uncharged capacitor until there is no net force on the charge carriers. This means that both capacitors are at the same potential, because if they were not, there would be an electric fieldand hence a force on the charge carriers of magnitudeand the charge carriers would move to equalize the potentials and reduce the electric field and hence the force, eventually to zero.
Of course, as charge flows from one capacitor to the other, the total charge is conserved.
In the diagram above, when switch is closed chraged flows from the top capacitor to the bottom. When charge has stopped flowing,
Also, because the potentials are equal(1)
Suppose then that the capacitor at top left is initially charged to potential ofand that it has capacitanceand is then connected to a capacitance
Initiallystores a charge
Then (3)
From (1) (4)
Sub (4) into (1) to get
Now usefor either capacitor to findUsing it for (2) gives
from A Level Physics Notes
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∙ 10y ago
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What happens when a capacitor is connected to a dc supply?
is it ? are you sure ? but i know so many circuit where capacitor is connected with ac supply . still , if u connected a capacitor to dc supply , then : 1. if it is in SERIES with the dc supply , it will block all the dc current as capacitor provides infinite resistance to dc current . application : where u want to block dc current.(simple high pass filter) 2. if it is in PARALLEL with the dc supply , it will not block dc current , but if any ac current comes out from the supply , the ac current will go through the capacitor , as capacitor provides small resistance to ac current. application : a) where u want to block ac current.(simple low pass filter) b) to filter the noise (ac components) of dc supply.
What happens when a capacitor reaches a steady state?
when a capacitor reaches it, it acts as a battery
What happens when lagging Power Factor changes to leading PF?
when lagging Power Factor changes to leading PF, then the voltage across the circuit in which capacitor bank is connected, is increased.
What happens to the voltage across a capacitor as it discharges?
well to get the answer first know the principle by which a capacitor(consider a capacitor without dielectric) gets charged .let a capacitor with plates p1 and p2 and resistor in parlell are connected to a DC source , when the switch is closed the circuit is in ON state and current starts flowing ,assume the flow of current as the movement of negative charges then the concept would be much clear. assume that p1 is connected with positive terminal of the battery and p2 with the negative terminal ,now as the switch is closed the negative charge on p1 is attracted by the positive terminal of the battery and is driven to the other plate p2 of capacitor.as this process continues charge seperation increases and potential difference starts getting developed and after a very long time the potential diff. across capacitor becomes equal to the applied voltage V. during discharging first of all we short the battery , this mplies that we are short circuiting plates p1 and p2 so again charge redistribution takes place and after a longtime both the plates become electrically nuetral
Why capacitor block direct current?
A capacitor opposes a change in voltage, but it will help to look at both the device and at a circuit up close to see what's going on. Any capacitor is two "plates" separated by a dielectric or insulator. Connect a wire to each plate and you've got the device. In a direct current circuit, the voltage source will cause current flow in only one direction. A common battery is a good example. Let's look further. When a capacitor is connected in a DC circuit and the circuit is energized, the voltage source will want to cause current to flow in only the one direction. In the initial moment when the power is switched on, electrons will flow in the circuit. Electrons will leave the negative terminal of the source and enter the positive terminal. The current flow will travel through the wire, and electrons will "pile up" on one of the plates of the capacitor. As electrons are "piling up" on one plate, their presence there will create an electric field across the dielectric to the other plate. This electric field will cause electrons on that other plate to leave. The capacitor is charging, and the voltage source will, for the first instant of time, think that things are "fine" and current will flow. But as the capacitor charges, current flow drops off, and it eventually stops when the voltage across the plates equals the source voltage. In review, as the DC power is switched on in a circuit with a capacitor in it, current will flow "normally" for the first instant. But as the first electrons arrive on one plate and force them off the other plate, current in the circuit will begin dropping off. The voltage developing across the plates of the capacitor opposes the battery voltage. Eventually the capacitor is charged and all current flow has stopped. There is some math that says something slightly different, but for all practical purposes, the capacitor is considered fully charged in a very short period of time. This will depend on circuit resistance and the ability of the source to deliver current, of course. But that capacitor will, when charged, not "pass" any more current. The voltage across the plates is equal to (an opposing) the source voltage, and no more electrons can get onto the negative plate to force more off the positive plate.
What happens to an uncharged object when it comes in contact with a charged object.After the object that was charged lost electrons and the uncharged object gained electrons?
It becomes charged. (negatively)
What happens when you add electrons to an uncharged object?
you will get shocked and it will probaly hurt
What happens if you connect an uncharged capacitor to your amp?
if you use a uncharged capacitor most likely your car battery will drain much faster using a uncarged capaciter will mess up your amp good power source is needed for your amp to give its maximum potential for deeper bass and no dimming
What happens when a charged electroscope is connected to an uncharged electroscope by a metal wire?
Charge would flow from the charged electroscope to the initially uncharged one, until the charges are equal on both. At that point, the potential on both ends of the wire would be equal, there would be no voltage across the wire, and no more current would flow. Both electroscopes would then be charged, with charge of the same sign, and with half as much charge as the initially-charged one had.
What happens to the capacitance fi the charge on the plates of a capacitor is doubled?
The capacitance doesn't depend on the charge stored in it. The capacitor has the same capacitance whether it's charged by a DC and just holding it, or in an AC circuit where the charge on it keeps changing and reversing, or in a box on the shelf connected to nothing and not charged at all.
What happens to the force between charged and uncharged objects as the distance between them decreases?
there is an electric shock when the charge transfers
What happens when a capacitor when it is connected to a higher voltage?
If you apply a higher voltage to a capacitor than it is rated it could over heat and explode.
What happens when a capacitor connected across a battery for a long time?
For a long time, The capacitor will be charged to the voltage of the DC battery, the positive side of the capacitor touching the positive terminal of the battery. Not much DC current will conduct, except for some tiny leakage current due to imperfection of the cap. The battery will be drained eventually.
What happens when led is connected in series with capacitor?
As the capacitor charges the led will dim until it's minimum operational voltage is reached and it goes out.
What can happen when an charged object can be brought near an uncharged object?
A neutrally charged object can still be affected by a charged object. If a neutrally charged object is being approached by a negatively charged objects, the electrons within the neutrally charged object will migrate to the other side (as the two negative charges repel), leaving the side closes to the negative object positive. Protons do not move. From there, the protons are attracted to the electrons, therefore moving the 'uncharged' object.
What happens to the force between charged and uncharged objects as the distance between them increased?
as the distance is increased statically induced charge in the uncharged object reduced to a minimum. Thus coulombic force which is directly proportional to the product of the charges tends to 0.
What happens when charged object are brought near uncharged objects?
the electric-charge interaction occurs when a''charge'' object is near another ''charge'' or ''uncharde''object
