What is the structure of a coaxial cable in electromagnetics, and what is the direction of the curre

There are two concentric conductors, and the conductor and shield share the same axis, the coaxial cable.

It is divided into four layers from the inside to the outside, with a central copper wire (a single strand of solid wire or a multi-strand stranded wire), and a plastic insulator.

Mesh conductive layer and wire sheath. The central copper wire and the mesh conductive layer form a current loop. It is named because the central copper wire and the mesh conductive layer are coaxial.

Coaxial cables conduct alternating current.

and not direct current, which means every second.

There were several times when the direction of the current was reversed.

Coaxial cable (refers to a cable with two concentric conductors, and the conductor and shield share the same axis.) Coaxial cables are used to conduct alternating current, and the direction of the current is always changing.

The basic structure of a coaxial cable is divided into four layers from the inside out: a central copper wire (a solid wire with a single strand or a stranded wire), a plastic insulator, a mesh conductive layer, and a wire sheath. The central copper wire and the mesh conductive layer form a current loop.

It is named because the central copper wire and the mesh conductive layer are coaxial.

If a high-frequency current is transmitted using a normal wire, the wire acts as an antenna that emits radio outwards, an effect that dissipates the power of the signal and reduces the strength of the received signal. The radio emitted by the center wire of the coaxial cable is isolated by the outer conductive layer, and the outer conductive layer can control the transmitted radio by grounding.

Coaxial cables are used for the transmission of high-frequency alternating current.

Coaxial cable: It is two long cylinders that are coaxial, and current flows in from one end of the inner shaft of the solid and flows out from the other end of the outer cylinder, so that not only the solid inner cylinder has current, but also the outer cylinder.

The inner surface of the shell is of the outer cylinder, which is insulated from the solid conductor of the inner cylinder, so it will not coincide.

A coaxial cable is like a stranded wire, where one current flows in and the other out.

In a steady magnetic field, the linear integration of the magnetic induction intensity b along any closed path is equal to the algebraic sum of the individual currents enclosed by that closed path. This conclusion is called the Ampere Circuital Theorem. The Ampere Loop Theorem can be derived from Biot-Savar Law.

It reflects the interconnected nature of the magnetic induction wires and current-carrying wires of a steady magnetic field.

Its mathematical expression is:

According to the Ampere Loop Theorem, the positive or negative currents surrounded by the loop should obey the right-hand spiral rule. The ampere loop theorem applies if the closed path l surrounds two currents i1 and i2 flowing in opposite directions.