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If you take out the battery in a capacitor before inserting a dielectric will there still be charge on the dielectric?
The charge in a capacitor is between the plates. The dielectric is only an insulator that allows the plates to be very close without touching and discharging the charge. There is no battery in a capacitor.
What happens to the charge of a capacitor when a dielectric slab is fit in it?
Changing the dielectric causes the capacitance to change.
What makes the capacitor to store charges?
A capacitor consists of two plates (foils ...) separated by an insulating medium. The insulating medium may be air, oil, a plastic film, and so on, and is known as the dielectric. The charge on the capacitor is actually stored by slightly distorting the molecules in the dielectric. The quality of a dielectric is measured by a factor known as K, and a higher K means that the molecule can store a larger distortion. When we discharge the capacitor, the molecules are allowed to relax to their uncharged state.
What happens when dielectric breakdown occurs?
The dielectric,usually the insulator between the plates of a capacitor, can be overstressed by the application of too high voltages applied to the capacitor plates. The dielectric breaks down and a current flows between the plates until,either they are discharged, or an equilibrium is reached,below the working voltage of the capacitor. If the dielectric is damaged in this process he capacitor must be replaced. Some dielectric material self heal and can recover from an over voltage.
What is a dielectric?
In physics, a dielectric is an insulating (or very poorly conducting) material. The material can be solid, liquid or gaseous. When a voltage difference is applied to top and bottom of a cylinder filled with a dielectric, no current will flow inside the cylinder because, unlike metals, a dielectric has no free-or loosely bound-electrons that can drift through the material. Instead, electric polarization occurs. The positive charges within the dielectric are displaced minutely in the direction of lower voltage, and the negative charges are displaced minutely in the opposite direction. When the molecules constituting the dielectric are polar (like water molecules), the molecules will align in the field, thus contributing to the electric polarization. Inside the cylinder no net charge density will arise because the charges in adjacent volume elements cancel. However, at the top and bottom of the cylinder an uncanceled surface charge will appear, and this surface charge (positive at the low voltage side and negative at the high voltage side) will oppose the electric field associated with the voltage difference. Thus, the polarization of the dielectric reduces the electric field inside the dielectric. Dielectric material is characterized by an intrinsic property called relative permittivity, usually denoted by εr (formerly this was known as the dielectric constant). The relative permittivity describes the ease of the polarization of the material and determines the size of the surface charge densities at the top and bottom of the cylinder. The Coulomb force between two permanent electric point charges placed inside a dielectric medium is 1/εr smaller than it would be in a vacuum due to the polarization of the dielectric medium by the point charges. The quantity of electric energy stored per unit volume of a dielectric medium is proportional to εr. The capacitance of a capacitor filled with a dielectric is a factor εr greater than it would be in vacuum. Reference: http://en.citizendium.org/wiki/DielectricDielectric is a substance that can transport electricity without conducting it.
What is the effect of a dielectric on the energy stored in a capacitor?
A dielectric increases the energy stored in a capacitor by reducing the electric field strength between the plates, allowing for more charge to be stored at a lower voltage.
How does the insertion of a dielectric affect the capacitance of a capacitor?
When a dielectric is inserted between the plates of a capacitor, it increases the capacitance of the capacitor. This is because the dielectric material reduces the electric field between the plates, allowing more charge to be stored on the plates for a given voltage.
What is the effect of inserting a dielectric other than air or vacuum between the plates of a capacitors?
Inserting a dielectric material between the plates of a capacitor increases the capacitance of the capacitor. The dielectric reduces the electric field between the plates and allows for more charge to be stored. This results in an increase in the amount of electric potential energy that can be stored in the capacitor.
What is the role of a dielectric in enhancing the capacitance of a parallel plate capacitor?
A dielectric in a parallel plate capacitor helps increase the capacitance by reducing the electric field strength between the plates, allowing more charge to be stored.
What term is defined as the amount of charge stored per volt?
The term defined as the amount of charge stored per volt is capacitance. It quantifies the ability of an object to store electrical energy when a voltage difference is applied across it.
If you take out the battery in a capacitor before inserting a dielectric will there still be charge on the dielectric?
The charge in a capacitor is between the plates. The dielectric is only an insulator that allows the plates to be very close without touching and discharging the charge. There is no battery in a capacitor.
Why is insulator called dielectric?
An insulator is called a dielectric because it is able to store and support an electric charge without conducting electricity. Dielectric materials in insulators have high resistance to electric current, which allows them to be used as a barrier against the flow of electricity in electrical circuits.
What are the three factors that determine the charge of a capacitor?
If you mean the capacity of the capacitor then, Factors are:- Area of of overlap of the plates Separation of the plates How good is the insulating material between the plates (the dielectric) If you mean how large a charge can be stored then, Factors are:- The capacitance of the capacitor (C). The applied voltage (V). Charge Q =CxV V cannot exceed the dielectric's breakdown voltage.
What happens to the charge of a capacitor when a dielectric slab is fit in it?
Changing the dielectric causes the capacitance to change.
What is the purpose of a dielectric in a capacitor?
Two functions - it provides electrical insulation, and it increases the capacitance, i.e., the amount of charge - and therefore also the amount of energy - that can be stored at a given voltage.
What will happen when a dielectric slab is inserted in the parallel plate capacitor?
(a) Charge Will increase (b) Potential difference will stay the same (c) Capacitance will increase (d) Stored energy will decrease
What happens to charge and potential difference and capacitance in the presence of dielectric when the battery is disconnected from the capacitors?
The capacitor will hold the charge, until it leaks off due to resistances in the dielectric or external.
