YCWPK移动橡套抗拉卷筒电缆详细介绍

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磁力方向确定法：左手定则

Determination of magnetic direction: left hand rule

左手定则

Left hand rule

通电导体在磁场中所受的电磁力方向与电流方向和磁场方向有关。三者之间的关系可用左手定则确定，如右图所示。左手定则的确定方法如下：

The direction of the electromagnetic force of the electrified conductor in the magnetic field is related to the current direction and the magnetic field direction. The relationship among the three can be determined by the left-hand rule, as shown in the right figure. The left-hand rule is determined as follows:

将左手伸开，让磁力线穿过掌心，四指代表电流方向，则张开的大拇指指向就表示电磁力的方向。YCWPK移动橡套抗拉卷筒电缆

Extend the left hand, let the magnetic field line pass through the palm center, four fingers represent the direction of current, then the open thumb points to represent the direction of electromagnetic force.

在使用左手定则时应注意，伸开的左手，其拇指和其余四指应相互垂直并在一个平面内。

When using the left-hand rule, it should be noted that the thumb and other four fingers of the extended left hand should be perpendicular to each other and in a plane.

磁场对载流导体的作用

The effect of magnetic field on current carrying conductor

磁场对电流的作用作为磁场对载流导体受作用的例子，把两根载流直导线平行放在一起，实验表明，如果两直线所流过的电流方向相同，则相互吸引，反之，如果两载流导线流过的电流方向相反，则相互排斥。

The effect of magnetic field on current is an example of the effect of magnetic field on current carrying conductor. Two current carrying straight wires are put together in parallel. The experiment shows that if the current direction of the two straight lines is the same, they attract each other. Otherwise, if the current direction of the two current carrying wires is opposite, they repel each other.

出现这一现象的原因是：两根载流直导线要收到彼此的电磁力的作用，此电磁力的方向可由左手定则判定（如右图所示）。

The reason for this phenomenon is that two current carrying straight wires need to receive the effect of each other&＃39;s electromagnetic force, and the direction of this electromagnetic force can be determined by the left-hand rule (as shown in the right figure).

上述现象很有实际意义，发电厂、变电站、工厂的配电室的母线排（汇流排），便是相互平行的载流直导线。为了使母线有足够的机械强度，常常每隔一定距离安装一绝缘支柱，以防止发生短路时过大的短路电流所产生的巨大电磁力所引起的破坏作用。此外，电动式测量仪表也是根据通电导体在磁场中受电磁力的原理而工作的。

The above phenomenon is of great practical significance. The bus bars (busbars) in power plants, substations and distribution rooms of factories are parallel current carrying straight conductors. In order to make the bus have enough mechanical strength, an insulating pillar is often installed every certain distance to prevent the damage caused by the huge electromagnetic force caused by the excessive short-circuit current. In addition, the electric measuring instrument also works according to the principle that the electrified conductor receives electromagnetic force in the magnetic field.