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Maxwell equations give the law of electromagnetic field movement, including the effect of charge current on electromagnetic field. The effect of electromagnetic field on charge current is given by Lorentz force formula. The content of Lorentz force formula is: no matter how the charge current and electromagnetic field change, the force on the charge current in unit volume can be expressed as
⑹
the above formula is obtained by extending the static charge force formula and stable current force formula given by Coulomb's law and Ampere's law, It has been proved by practice (for example, in the design of electronic instruments and accelerators)< *** Therefore, Maxwell equations and Lorentz force formula constitute a complete system to describe the general law of electromagnetic field motion and electromagnetic action
the interaction between electromagnetic field and medium is often involved in the macro electromagnetic problems. When the medium exists, the above Maxwell equations still hold. What needs to be discussed is what kind of macro charge current will appear in the medium and how to determine them
under the action of electromagnetic field, there are three kinds of processes in static medium: polarization, magnetization and conction. These processes will cause macro current in the medium. In the Gauss unit system, the total current density is
8
where the first term on the right represents the conction current, which appears only in the conctive medium; The second term represents the polarization current, and P is the polarization strength of the medium; The third term represents the magnetizing current, and M is the magnetization of the medium. Both conction current and polarization current can lead to macroscopic charge distribution in the medium. The charge accumulated by conction current is called free charge, and the charge accumulated by polarization current is called polarization charge, and its value is - u · P. The magnetization current does not lead to charge accumulation, so the total charge density in the medium is
ρ=ρ F-p. (9) by substituting equations (8) and (9) into Maxwell's equations, it can be reced to
d = 4 πρ f. ⒀
⒀
where d = e + 4 π p、H=B-4 π M. They are called electric displacement and magnetic field strength respectively. The above four equations are the usual forms of Maxwell equations in media

It is normal that the network delay is less than 100ms

1, 1 ~ 30ms: extremely fast, almost no delay, playing any game speed is particularly smooth

2, 31 ~ 50ms: good, can play normally, no obvious delay

3, 51 ~ 100ms: ordinary, antagonistic games can feel significant delay, a little pause

4、> 100ms: poor, unable to play normally, stuck, packet loss and offline

calculation method: 1s = 1000ms (for example: 30ms is 0.03s)

extended data:

in the network media, all kinds of data are transmitted through network Protocols (such as TCP / IP). If the amount of information is too large and not limited, excessive network traffic will lead to slow response of the device, resulting in network delay

if the distance between your mobile phone or notebook and the wireless router is too far, or you need to pass through the wall and other obstacles in the middle, the wireless signal will be greatly attenuated and the wireless network speed will be unstable, so try to rece the distance and avoid obstacles; The wireless router should be far away from the interference of wireless devices such as cordless telephone, microwave oven, mobile phone Bluetooth, wireless keyboard and mouse as far as possible; It is recommended to turn off the router for a period of time and then turn it on. It is best to place the router in a well ventilated place