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In a capacitor, the charges on the opposing plates are equal in magnitude but opposite in sign. This means that if one plate has a positive charge, the other plate will have an equivalent negative charge. This separation of charge creates an electric field between the plates, allowing the capacitor to store electrical energy. The relationship between the charges and the capacitance is described by the formula ( Q = C \cdot V ), where ( Q ) is the charge, ( C ) is the capacitance, and ( V ) is the voltage across the plates.
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What is the field outside the capacitor plates?
The field outside the capacitor plates is primarily an electric field generated by the separation of positive and negative charges on the plates. This field extends into the space surrounding the capacitor, but its strength diminishes with distance from the plates. In an ideal capacitor, the electric field is uniform between the plates, while outside, it may be less uniform and weaker. The surrounding environment can also influence the field, particularly if there are nearby conductive or dielectric materials.
Why dc can be stored ac cannot stored?
Why direct current (DC) can be stored but alternating current(AC) can not be? Current means flow of charge per unit second. Any flow cannot be made stationary. Then it is not flow. Hence both direct current and alternating current cannot be stored. We can store only charges. In capacitors we store charges and not current. For storing we use direct supply or direct voltage When a capacitor is connected to a battery, which is a source of direct voltage, each plate of the condenser get charged. Charges remain in the plates. No current flows in between the plates. When the source is removed, there are some charges left in the plates. We say that charges are stored in the plates. If an alternating source of supply is connected in between the plates,every instant ,the charges in the plates are alternating and they are not stationary. When ac supply is removed, all the charges move out of the plates and hence no charge is left in them. Hence charges can be stored with dc supply and not with ac supply. However as long as the ac is connected to the capacitor, the capacitor gets stored and emptied with the frequency of the ac supply.
Why does each plate receive charge of exactly same magnitude?
the plates of capacitor are connected to the same battery so same potential difference will develop across the plates of capacitors, as a result charges of same magnitude will be stored, as the charges are being supplied by the same battery.
Charge buildup between the plates of a capacitor stops when?
Charge buildup between the plates of a capacitor stops when the current flow through the capacitor goes to zero.
A 5 uf capacitor has 5x10 -4 coulombs a charge stored in its plates find the voltage across the capacitor?
A5uf capacitor has 5*10-4 coulombs of charge stored on its plates
Why does a charged capacitor have a net charge of zero?
A charged capacitor consists of two conductive plates with opposite charges. These charges cancel each other out, resulting in a net charge of zero for the capacitor as a whole.
How does the voltage across a parallel plate capacitor change when connected to a battery?
When a parallel plate capacitor is connected to a battery, the voltage across the capacitor increases as it charges. The battery provides a potential difference that causes charges to accumulate on the plates, leading to an increase in voltage until the capacitor is fully charged.
What is the field outside the capacitor plates?
The field outside the capacitor plates is primarily an electric field generated by the separation of positive and negative charges on the plates. This field extends into the space surrounding the capacitor, but its strength diminishes with distance from the plates. In an ideal capacitor, the electric field is uniform between the plates, while outside, it may be less uniform and weaker. The surrounding environment can also influence the field, particularly if there are nearby conductive or dielectric materials.
Does a charged capacitor have an identical level of charge on both plates?
No, in a charged capacitor, one plate has a positive charge and the other plate has a negative charge. The magnitude of the charges on the plates is equal and opposite, resulting in a net charge of zero for the entire capacitor.
How does current flow in a capacitor?
Current does not flow through a capacitor in the same way as through a resistor. Instead, when a voltage is applied to a capacitor, it charges up by storing energy in an electric field between its plates. This stored energy can then be released when the capacitor discharges.
What is the effect of a dielectric material on the electric field of a capacitor?
A dielectric material placed between the plates of a capacitor reduces the electric field strength within the capacitor, increasing its capacitance. This is because the dielectric material polarizes in response to the electric field, creating an opposing electric field that weakens the overall field between the plates.
How does a capacitor discharge when a resistor is connected if there is dielectric material separating the two plates and the flow of electrons Is there some kind of path created within the material?
When a resistor is connected to a capacitor with dielectric material between the plates, the capacitor discharges through the resistor. The dielectric material remains an insulator and does not directly create a path for electron flow. Instead, the charges on the plates induce an electric field in the dielectric, which stores energy until the capacitor discharges through the resistor, allowing the charges to flow back and neutralize.
How does a capacitor connected to a battery store and release electrical energy?
A capacitor connected to a battery stores electrical energy by accumulating opposite charges on its plates, creating an electric field. When the capacitor is connected to a circuit, it releases stored energy by allowing the charges to flow back through the circuit, creating an electric current.
Why dc can be stored ac cannot stored?
Why direct current (DC) can be stored but alternating current(AC) can not be? Current means flow of charge per unit second. Any flow cannot be made stationary. Then it is not flow. Hence both direct current and alternating current cannot be stored. We can store only charges. In capacitors we store charges and not current. For storing we use direct supply or direct voltage When a capacitor is connected to a battery, which is a source of direct voltage, each plate of the condenser get charged. Charges remain in the plates. No current flows in between the plates. When the source is removed, there are some charges left in the plates. We say that charges are stored in the plates. If an alternating source of supply is connected in between the plates,every instant ,the charges in the plates are alternating and they are not stationary. When ac supply is removed, all the charges move out of the plates and hence no charge is left in them. Hence charges can be stored with dc supply and not with ac supply. However as long as the ac is connected to the capacitor, the capacitor gets stored and emptied with the frequency of the ac supply.
Why does a capacitor stores a limited amount of energy?
A capacitor stores energy by accumulating opposite charges on its plates. However, it has a limited capacity based on its size and dielectric material. Once the capacitor reaches its maximum charge, it can no longer store additional energy.
Why does each plate receive charge of exactly same magnitude?
the plates of capacitor are connected to the same battery so same potential difference will develop across the plates of capacitors, as a result charges of same magnitude will be stored, as the charges are being supplied by the same battery.
Charge buildup between the plates of a capacitor stops when?
Charge buildup between the plates of a capacitor stops when the current flow through the capacitor goes to zero.
