- #1
pardesi
- 339
- 0
given an arbitrary circuit when can u say that a given capacitor of course in the circuit has been fully charged
pardesi said:given an arbitrary circuit when can u say that a given capacitor of course in the circuit has been fully charged
pardesi said:i want something more specific for a DC circuit as to what decides what the cahrge on the capacitor shoud be. i would like an answer in terms of field concept rather than potential
pardesi said:i want something more specific for a DC circuit as to what decides what the cahrge on the capacitor shoud be. i would like an answer in terms of field concept rather than potential
pardesi said:i don't think so.even when the charging is taking place it passes through a series of 'equilibrium states'
otherwise consider this case of a simple 1 capacitor being charged which is say connected to one resistor which may be the net resistance of wire itself
any standard book would give a proof like this
[tex]\frac{q}{C}+\frac{dq}{dt}R - E=0[/tex]
well this done by assuming the potential at the positive terminal of battery is same as that of that in the positive terminal of capacitor which clearly holds only if there is no field 'inside' the wire.
pardesi said:if thsi is so then how does the differential equation i wrote above(which is there i suppose in all the books) holds true
pardesi said:but without the net fiedl inside the circuit being 0 the above DE is meaningless
also can u post an elink to the book if any
pardesi said:that's what i am telling if there is a field then the that diffrernetial equation doesn't hold good because it is true by assuming there is no field inside the conducting wires
pardesi said:i don't think so.even when the charging is taking place it passes through a series of 'equilibrium states'
otherwise consider this case of a simple 1 capacitor being charged which is say connected to one resistor which may be the net resistance of wire itself
any standard book would give a proof like this
[tex]\frac{q}{C}+\frac{dq}{dt}R - E=0[/tex]
well this done by assuming the potential at the positive terminal of battery is same as that of that in the positive terminal of capacitor which clearly holds only if there is no field 'inside' the wire.
pardesi said:well can u derive the equation without assuming field in wire is not 0
pardesi said:well while deriving even by energy conservation i think u have to assume that the potential on one plate of capacitor is same as that of battery...which doesn't hold true when there is an field inside the wire
but anyway my problem is that if why does a capacitor in any given circuit can get charged say only upto [tex]Q[/tex] not more or less.what governs the charge distribution. when does it stop charging...
can u please explain them in field concept
pardesi said:exactly that was what i thought if there were nio field due to capacitor why should charging due to battery ever stop ...
well going like that what i got was given a capacitor when it was connected to a circuit then the field due to it hence charge on it is fixed ...like someone(sorry) did it on the first page of this thread.
this is of course wrong
sir can u tell me is the charge distribution on a capacitor uniform or un-uniform also why do opposte plates get oppositely charged
A charge capacitor is a component in an electrical circuit that stores electrical energy in the form of an electric charge. It consists of two conductive plates separated by an insulating material, or dielectric.
A charge capacitor becomes fully charged when it reaches its maximum capacity to store electric charge. This happens when an electric current is applied to it, causing electrons to accumulate on one plate and leave the other plate with a positive charge.
When a charge capacitor is fully charged, it stops accumulating charge and acts as an open circuit. It blocks any further flow of current and maintains the accumulated charge until it is discharged.
The time it takes for a charge capacitor to become fully charged depends on the capacitance of the capacitor and the current flowing through the circuit. It can range from a few microseconds to several minutes.
A fully charged capacitor can be used to store energy and release it in a controlled manner, such as in flash cameras, defibrillators, and power supplies. It can also be used as a timing element in electronic circuits and to filter out unwanted signals.