What is the Electric field inside a Dielectric?
E = Eo/k k is dielectric constant
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.
The electric field is weakened when a dielectric is inserted.
A dielectric is an insulating material that does not conduct electricity and is transparent to an electromagnetic field. Dielectric materials are used to separate conducting surfaces such as the plates inside a capacitor, wires inside transformers, electric cable conductors, and elsewhere in the electric industry where electrical separation of charged elements is necessary. The dielectric constant is a ratio of the capacitance of a capacitor in which a particular insulating material is the dielectric, to… Read More
'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… Read More
In the electric field inside the dielectric (or insulating) medium separating the two plates
It is the tensile force experienced by cable insulation Answer I think you mean either 'dielectric strength' or 'dielectric strain', rather than 'dielectric stress'. Dielectric strength is a measure of the maximum electric field a dielectric can withstand before breakdown, expressed in volts per metre. Dielectric strain is a measure of the electric flux density of an electric field, expressed in coulombs per square metre.
A dielectric whose polarization always has a direction that is parallel to the applied electric field, and a magnitude which does not depend on the direction of the electric field. I have unfortunately no example to give you. But some plastics do have properties close to being isotropic dielectric.
An induced electric field is produced exactly in opposite direction within the 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… Read More
An electrical insulator that can be polarized by an external electric field.
If the distance between the parallel plate capacitor is reduced to half and a dielectric of dielectric constant k is introduced then how does electric field varies?
From the formula, E = V/d, where V is the voltage and d is the distance, it can be seen that the electric field and the distance are inversely related. Thus, as the distance between the parallel plate capacitors is reduced to half, the electric field is increased twice. Moreover, is a dielectric constant k is introduced, the capacitance will increase. This direct relationship can be seen in the formula, C = [k(Єo)A]/d, where k… Read More
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
In SI, the unit of dielectric strength is volts per meter (V/m). In U.S. customary units, dielectric strength is often specified in volts per mil. In physics, dielectric strength 2 meanings: Of an insulating material, the maximum electric field that a pure material can withstand under ideal conditions without breaking down. For a specific configuration of dielectric material and electrodes, the minimum applied electric field that results in breakdown.
One field in which this is helpful is in the manufacture of insulating materials. Dielectric strength determines the strongest electric field an insulator can withstand before it fails. For example, if the insulation around a wire melts or breaks, the insulator's dielectric strength is compromised.
A metal film capacitor is an electrical part that holds energy electrostatically inside of an electric field. The capacitor has a dielectric which separates two electrical parts which are made out of thin film.
Usually, dielectric materials have permanent dipoles. As temperature increases, the molecules in the dielectric have more thermal energy and therefore, the amplitude of random motion is greater. This means that the molecules are less closely aligned with each other (even in the presence of an electric field). Hence, the dielectric constant reduces.
Dielectric heating is a type of heating used in engineering. Insulated materials are heated and then put over an electric field that changes quickly. It is usually used for making plastics and rubber.
The dielectric strength refers to the maximum working voltage that a material can withstand without breaking down. At breakdown the electric field frees bound electrons turning the material into a conductor.
How is a charged particle accelerated when the electric field inside the dees of a cyclotron is zero?
it is the magnetic field not the electric field which accelerates the ion inside the dees
because the covalent compounds are non-polar and when they are placed in the electric field so no effect is created on the field.
to concentrate the electric field there, making it easier to breakdown the air dielectric and discharge accumulated atmospheric electric charge.
If a very large electric field is applied on a conductor then a phenomenon of a dielectric breakdown takes place and it looses all its charge carriers to the nearest conductor. Hence becoming an insulator.
Water, due to its polar nature, has a large dielectric constant. Therefore, water molecule has a very large electric dipole moment and is forced to rotate to respond to an alternate external electric field. Hence water as a liquid has a very large dielectric constant i.e. 80. Mica on the other hand is less polar as water and hence has low dielectric constant.
An Electric field stress depends on the mechanical strength of the materials and the stresses that are generated during their operation. During high voltage applications, the dielectric strength of insulating materials are developed when subjected to high voltages.
The dielectric constant is related to the electronic susceptance in an isotropic material. The susceptance is basically the ratio of polarization to applied electric field. You can think about a conductor as having "bound" electrons in that they cannot leave the entire material, but are free to polarize across the entire length of a conductor. When you apply an external electric field to a conductor, you polarize the entire conductor, such that the polarization causes… Read More
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.
It's a temperature dependent variable. Most data sheets from chemical suppliers state the dielectric constant at 25C (77F) as 20.7. As an aside, the term dielectric constant should only apply to values measured at zero frequency as dielectric permittivity changes according to theoscillationof the applied electric field
Magic. Look up capacitors on wikipedia!! A capacitor stores electrical charges in its plates. Both wrong. A capacitor stores energy as an electric field developed in the dielectric between its plates. A good dielectric with high permittivity (once called dielectric constant) concentrates this field, allowing more energy to be stored in a capacitor having the same plate area and separation but a dielectric of lower permittivity.
If the charge is uniformly distributed over the shell, then the electric field is zero everywhere inside.
A strong electric field exists in the vinicity of the faraday cage why the person inside the cage is not affected?
That's because there is no electric field inside the cage.
Voltage in a capacitor is stored in the electric field between (or across) the plates of the cap. Charges arriving on one side "push" charges off the other side, and the field builds up across the dielectric. That electric field is the energy reservoir of the capacitor.
1. Electric field lines of force originate from the positive charge and terminate at the negative charge. 2. Electric field lines of force can never intersect each other. 3. Electric field lines of force are not present inside the conductor, it is because electric field inside the conductor is always zero. 4. Electric field lines of force are always perpendicular to the surface of conductor. 5. Curved electric field lines are always non-uniform in nature.
the dielectric strength of a material is defined as the min electric stree due to which the meterial get ruptured is called dielectric strngth of that material.
A dielectric is an insulator which, when exposed to an electric field, results in the distortion of the electron orbits surrounding its fixed nucleii, and causes the polarisation of those atoms. The direction of this polarisation is opposite to that of the electric field and, therefore, acts to reduce the magnitude of the field. In the case of a capacitor, dielectrics, therefore, act to change the capacitance of a capacitor which otherwise depends upon the… Read More
The dielectric constant measures how strongly the eletronic charge in the material can adjust to shield an external electric field, larger the dieletric constant, more effective is the screening. But for the electronic charge be able to adjust responding to the electric field, the electrons should be easily moved, which means that each electronic state will change assuming a polarized configuration. If the gap is large, the electric field can not mix the electronic states… Read More
Dielectric decrease electric force and capacitance is inversely proportional by electric force Sources: http://hyperphysics.phy-astr.gsu.edu/Hbase/electric/dielec.html
charge always resides on the surface of the conductors charge inside the conductor is zero. so according to Gauss there is no flux inside it.as there is no flux so there is no electric field
A dielectric material is an electrical insulator that's able to be polarized by an electric current. A dielectric cell is, as such, a cell containing this material.
A 'dielectric' describes a material that supports an electric field and is generally used to describe an insulating material. Two properties exhibited by a dielectric are its permittivity and its dielectric strength. High values of permittivity (abillity to improve capacitance) are desirable for dielectrics used in capacitors, and high values of dielectric strength (ability to withstand voltages) are desirable for insulators but, unfortunately, the two quantities aren't relatated. So, selecting a dielectric is a matter… Read More
The relative permittivity of a material is its dielectric permittivity expressed as a ratio relative to the permittivity of vacuum. Permittivity is a material property that expresses the force between two point charges in the material. Relative permittivity is the factor by which the electric field between the charges is decreased or increased relative to vacuum. Likewise, relative permittivity is the ratio of the capacitance of a capacitor using that material as a dielectric, compared… Read More
Electricity is formed (electrons move )
That will depend on the dielectric. There will be two main effects - any change in the permeativity of the dielectric, and thermal expansion which will increase the distance between the plates. There will also be an change (probably an increase), in leakage current through the dielectric. Any change is very likely to be small or insignificant - I have worked in a factory making capacitors and temperatures were very variable, not controlled, for measurements… Read More
Inside a conductor, it's zero.
The field is zero inside only if any charge is evenly distributed on the surface. That's a mathematical theorem, sorry I don't have the proof handy. But when you measure the electric field inside a charged sphere, the charge you use might be large enough to redistribute the surface charge. In this case the electric field will not be zero. Only if you measure at the centre.
When an electric field is applied to a conductor does the electric field develops within the conductor or around the conductor?
The electric field will develop inside the conductor, depending on the characteristics of the electric field -- in a steady state (DC) or in an alternating mode (AC). The higher the frequency of oscillation, the shallower the field will reside in the conductor -- skin depth (check the related link). Hence, when the frequency is high, only the few mm's of the outer skin participates in the action (AC electrical conduction.) In steady state (DC)… Read More
Capacitors consist of a insulating material, called a 'dielectric', sandwiched between two conductors, called 'plates'. Capacitors are devices that store energy (not charge!); this energy is stored in the electric field set up within the dielectric between the two plates when they are connected to an external potential difference.
In conductors having sharp ages,electric field lines bulge out non uniformly. Let me be specific with a parallel plate capacitor.Herein at the ages of plates ,pattern of field lines is different from that within the dielectric.While inside dielectric they are straight,at corners they are bent. EFFECT: Due to bending of field lines flux is not properly linked with second plate which leads to NET DECREASE in capacitance. Akshay Bisht [NIT Jalandhar] INDIA
If the slab is zero thickness, nothing. The lines of electric field not intercepted by the slab are unaffected, so what goes on there is unaffected. The part where the lines are intercepted is converted to two capacitors in series, and the charges on opposite sides of the slab are equal and opposite, equal to the charge on the parts original outer plates facing it. From the outside view of the world, nothing changes on… Read More
The electric FIELD inside a charged hollow CONDUCTOR is zero.
The method of protecting a region from the effect of electric field is called electrostatic shielding. The electric field inside the cavity of a conductor is zero. Therefore, any instrument or an appliance can be placed in the cavity of a conductor so that it may not be affected by the electric field.