The electric field intensity of an infinitely long charged line is E=λ2πε0r Gauss's theorem Make a cylindrical surface with radius r and height h.field strength, the axis of the cylinder coincides with the charged straight line, and the field strength on the cylinder is the field strength E2πrh=λhε0 at the distance r from the straight line, which can be obtained E=λ2πε 0r, where λ is the charge line density of the charged straight line. Knowledge of the extended electric field refers to a special force produced by charges in space, which is one of the basic phenomena of electromagnetic phenomena; The charged quantity is Q, and the radius is R. The internal and external field strength and potential distribution of a uniformly charged sphere The internal field strength is E=0 The outside of the sphere is equivalent to a point of charge at the center of the sphere E= KQr^2rR The potential is equal, and the outside of the sphere is equivalent to a point of charge at the center of the sphere Φ=KQr. If it is a uniformly charged sphere, the result is the same as the spherical shell. Outside the sphere, this spherical shell can be treated as a point charge with all charges concentrated in the center of the sphere, and the potential distribution is k*4paiR^2σr.
As shown in the following figure, the common calculation formulas for electric field strength mainly include the following: 1E =Fq, which is a definition of electric field strength and is suitable for the calculation of all electric field strength. E represents the field strength of a certain point in the electric field, and F represents the electric field force exerted on the trial charge placed at this point. q refers to the charge amount of the trial charge. In this formula, E has nothing to do with F and q. There is no relationship between E and F proportional to q. 2E =kQr^; The radius ratio of S1 and S2 = r1r2, so the area ratio S1S2 = r1^2r2^2E1E2 =1 is equal, and the reverse combined field strength is 0. How to calculate the field strength inside a sphere with q-charged? Gauss's theorem is made at a distance from the center of the sphere r, and the electric flux on the sphere is 43π r #179 ×δε. Because the field strength is uniformly distributed, the magnitude of the field strength can be directly divided by the area 4π r #178.
The field strength E and the electric field strength E are two different physical quantities. The electric field strength E is a physical quantity describing the force of the electric field on a unit positive charge. The unit is Newton-Coulomb and the field strength E refers to the force of the magnetic field on the charge or magnetic moment. The unit is Newton-Coulomb field strength E. The relationship between the field strength E and the electric field strength E can be deduced through the Lorentz force formula. 2 The relationship between the field strength E and the magnetic induction strength B is based on the Lorentz force formula F=qE+v×B; Field strength is a physical quantity used to express the strength and direction of the electric field. The following is a detailed explanation of the definition of field strength. Field strength is the ratio of the electric field force to the acting charge at a certain point in the electric field. The ratio is a quantity independent of the charge at the test point. That is, the magnitude of the field strength is equal to the electric field force experienced by the unit test charge at that point. The vector field strength is a vector with a magnitude and direction, and its direction is defined as positive. The direction of the electric field force experienced by the test charge at that point.
First of all, it should be clear that Gauss's theorem can be used to solve the field strength formula in a uniformly charged sphere, and this formula is indeed inversely proportional to the cubic power of the distance r. Specifically, the electric field strength E in a uniformly charged sphere and the radius of the sphere R and the distance r from the point to the center of the sphere is E= kQrsup2Rsup3The core idea of Gauss's theorem is to solve the electric field generated by charges in a closed surface through the electric flux of the surface; The formula for calculating the magnitude of the field strength is E=UDE=UD, where E is the magnitude of the field strength, U is the potential difference, and D is the distance between the plates. This formula is suitable for calculating the potential difference and the magnitude of the field strength between any two points in a uniform electric field. Where, E is the magnitude of the field strength in volts meters Vm, U is the potential difference in volts V, D is the distance between two points in meters m. Note that the magnitude of the field strength is related to the potential difference and distance, when.
Relationship between field strength and potential
1. Field strength and electric field strength are the same physical concept. The following is a detailed explanation of their relationship. Definitions. The same field strength and electric field strength are both used to describe the strength and direction of the electric field. They are the basic physical quantities of the electric field. They are both represented by the symbol E to distinguish them from other physical quantity measurement formulas. General electric field situation E=Fq, where E represents the electric field strength, F is the force exerted by a charge in the electric field, and q is the common value of the charge quantity.
2. The field strength is the electric field strength. It is a physical quantity that describes the nature of the electric field. The following is a specific explanation of the field strength. The electric field strength is defined as the ratio of the electric field force F exerted on a charge placed in a certain point in the electric field to its charge quantity q. The mathematical expression is expressed as E = Fq where E represents the electric field strength, F represents the electric field force exerted on the charge at that point, and q represents the charge quantity of the charge. The physical meaning of the electric field strength reflectsfield strengthDetermine the strength of the electric field at a certain point.
3. This is consistent with the meaning of the field strength and voltage. At a certain point in the electric field, the ratio of the electric field force exerted by the positive charge at the trial point to the charge carried by it is a quantity that has nothing to do with the charge at the trial point. Therefore, the direction of the electric field force exerted by the positive charge at the trial point is the electric field direction. The vector with the aforementioned ratio as the magnitude is defined as the electric field strength at the point, which is often represented by E.
4. The electronegativity of the ligand Ligands with high electronegativity usually have higher field strengths because they are more attractive to electrons. The ligand's chemical structure has some structural characteristics, such as the existence of π bonds, which can enhance the field strength spectrum order of the ligand. This is a rule of thumb. There is a list called "Ligand Genealogy Order", which is arranged from low to high field strength.field strengthFor example, the field strength of common ligands, halogen ions is lower than that of water and ammonia. Spectral data is analyzed through the analysis of compounds.
5. The relationship between electromotive force and electric field strength is as follows: The field strength has no direct relationship with the potential because the value of the potential at a certain point is relative to the selected zero-point potential. The selected zero-point potential is different, and the field strength remains unchanged. The zero-potential can be artificially selected, and whether the field strength is zero is determined by the electric field itself. Introduction to potential energy 1 In electrostatics, potential energy is the potential energy of the charge distribution in the electric field, distributed with the charge in the system.
6. Field strength refers to the magnitude of the electric field force suffered by a unit charge in an electric field. It is a physical quantity that describes the strength and direction of the electric field. In physics, field strength is a very important concept used to describe the strength and direction of physical fields such as electric fields and magnetic fields. In the electric field, field strength is a vector with both magnitude and direction. It is usually expressed by E. The concept of field strength in volts meters Vm can be understood through a simple example.
Formula for calculating field strength
The solution is first set to make A plate capacitor composed of two parallel plates that are very close to each other. The areas of the plates are both S. Let the two plates have a charge of +Q respectively. The charge density of each plate is σ=QS. Remove the edge effect of the plates, so the electric field between the plates can be regarded as a uniform electric field. According to Gauss's theorem, the field strength between the two plates is E=σε. From the formula of plate capacitance, C=S4πkd can be obtained.
In general, the conversion and comparison between power dBm and field strength dBuvm requires combining multiple factors such as antenna gain test equipment and communication environment to achieve the best performance of wireless communications.
The linear density of the rod is QL, then the field strength kQLdxr^2=kQdxLr^2 at a distance of d, integrating from d to d+L, and the direction E= kQL1d1d +L is directed towards the outside of the rod. 2 If the linear density of the rod is QL at a distance of d, then kQLdxr^2= kQLdxLr^2E = kQL1Ld1d at a distance of d, heading backwards.
Let the charge amount of the charges at the two points be q, the distance is R, and the positive direction is to the right. 1 The characteristics of the field strength are on the line connecting two equal positive charges, from point A to point B, the magnitude of the electric field strength decreases first and then increases., that is, at the midpoint O, the minimum field strength is 0.
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