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What is the Difference between dielectric and insulator?
The difference between dielectric and insulator lies in its field of application.Dielectrics are used to store the electric charges, while insulators are used to block the flow of electric charges ( they more or less act like a wall).While all dielectrics are insulators (they don't allow the flow of electric charges through them) all insulators aren't dielectric because they can't store charges unlike dielectrics.
How a two wire conductor has capacitance?
A two-wire conductor has capacitance due to the electric field that forms between the two wires when a voltage is applied across them. This electric field allows the wires to store electrical energy, effectively acting as a capacitor. The capacitance depends on factors such as the distance between the wires, their lengths, and the dielectric properties of the surrounding medium. Thus, even without a dielectric material, the two-wire arrangement inherently possesses capacitance.
A parallel plate capacitor has a plate separation of 1.0 mm How much potential difference can be placed across the capacitor before dielectric breakdown of air occurs?
You need more information than this to find your solution. There will be a a value for the electric field at which point the air will break down. you also need the area of one of the capacitors and the capacitence
How does a capacitor store energy?
The energy stored in a capacitor is almost entirely in the electric field produced between the plates. It takes energy from a battery or some other power source to move electrons to one of the plates and away from the other. This makes one plate positively charged and the other negatively charged. Electric field is produced in proportion to the charge per unit area on a plate, and this electric field is said to originate on positive charges and terminate on negative charges. Energy stored in electric fields is proportional to the square of the electric field strength and the volume of the field. The energy is transferred from the power source to the electric field through the rearrangement of electrical charges.
How do you flow current in capacitor through dielectric?
well actually current doesn't exactly pass through the capacitor or dielectric.Current just flows through the wires connected to the capacitor.The reason is that electric charges are only placed onto capacitor plates and they flow in the circuit and it seems to us that current is flowing in the circuit.Also remember that dielectric only increases the capacitance of a capacitor.AnswerThere are two types of electric current, termed 'conduction current' and 'displacement current', respectively.A 'conduction current' describes the drift of free electrons in a metal conductor. A 'displacement current' describes the polarisation of atoms in dielectrics.When an electric field is applied to a dielectric, the elliptical orbits of the electrons around each atom's nucleus become distorted, and stretch, resulting in polarised atoms. The amount of 'stretch' (polarisation) increases with the strength of the electric field. So, as the voltage across the changes so, too, does the amount of polarisation -i.e. so, too, does the displacement current.So when a capacitor is connected to an external d.c. supply, a varying conduction current drifts around the circuit conductor, while a displacement current occurs within the capacitor's dielectric. When a capacitor is connected to an external a.c. supply, a continuously varying potential difference results in a continuously changing conduction current in the metallic circuit, and a continuously changing displacement current within the capacitor's dielectric.
Why does the electric field inside a dielectric decrease when it is placed in an external electric field?
The net electric field inside a dielectric decreases due to polarization. The external electric field polarizes the dielectric and an electric field is produced due to this polarization. This internal electric field will be opposite to the external electric field and therefore the net electric field inside the dielectric will be less.
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.
What is dielectric stress?
The dielectric stress is the stress placed upon a material when a voltage is placed across it.
What is Dielectric field?
A dielectric field is a region around a charged object or between two oppositely charged objects where the electric field affects the alignment of electric dipoles within a dielectric material. Dielectrics are non-conducting materials that can store and transmit electric energy. The presence of the dielectric field can alter the overall electric field distribution in the space.
Why is air a dielectric material?
Air is a dielectric material because it contains molecules that can be polarized when placed in an electric field, allowing it to store electric charge and exhibit insulating properties. This property of air as a dielectric material is vital in various electrical and electronic applications.
Why is the dielectric constant value of covalent compounds is low?
The dielectric constant of covalent compounds is low because they have strong covalent bonds that do not allow for easy separation of charges when exposed to an electric field. This limits the ability of these compounds to induce an electric field within themselves and therefore results in a low dielectric constant.
Why does coulomb force between two point charges depends upon dielectric constant of the intervening medium?
It is because when a dielectric is placed between the charges , the dielectric gets polarized and the net electric field between the two charges decreases, hence force = charge x electric field also decreases. john
What is the definition of the term dielectric?
'Dielectric' is often used in a general sense to refer to a material (such as ceramic, mica, plastic or paper) which is a poor conductor of electricity. This term is used in the classical description of a capacitor -- two electric conductors separated by a dielectric. By applying electric charge to one conductor an electric field is created. The dielectric allows the electric field to pass through it and affect the other conductors; however the dielectric prevents electrons from flowing between the conductors, so the electric field remains (and the charge remains stored on the conductor). [Side note for beginners: An electric field creates a force (measured in Volts) upon an electron or charged particle which tends to make it move. The conductor allows electrons to move easily within it. The dielectric resists the movement of electrons in it.] More generally, we speak of a 'Dielectric Field' as a mathematic description of how electric charge influences the properties of the space around it. The Dielectric field interacts with space and with any material in the space to create an 'Electric Field'. In simple terms, the electric field at any point is the product of the dielectric field at that point and the 'Dielectric Constant' of the material at that point. In more general terms, the 'electric field vector' at a point is the tensor product of the 'dielectric field vector' and the 'dielectric tensor' of the material at that point. The dielectric field is not a measurable entity, but rather a mathematical tool that allows us accurately to model the electric field, which is measurable. The article on Dielectrics at http://en.wikipedia.org/wiki/Dielectric provides more description, especially on the dielectric field model.
What is the Electric field inside a Dielectric?
E = Eo/k k is dielectric constant
Why an insulator is also called dielectric?
An insulator is also called a dielectric because it is a material that does not conduct electricity easily due to its high resistance to the flow of electric current. Dielectrics are used in capacitors to store and release electrical energy. When placed in an electric field, dielectrics become polarized, creating an electric dipole moment that affects the overall behavior of the material in the field.
When a medium behave like dielectric?
When a medium behaves like a dielectric, it means that it can become polarized in the presence of an electric field. This polarization results in the medium experiencing forces and interactions with the electric field, affecting the overall behavior of the system. Dielectric materials are characterized by their ability to store electrical energy in the form of electric field-induced polarization.
What is the effect of electric field on dielectric material?
An electric field applied to a dielectric material causes the material's dipoles to align with the field, inducing polarization. This polarization reduces the overall electric field inside the material, making it an insulator. This effect increases the capacitance of capacitors and reduces the field strength in electrical systems.
