Magnetic Force Between Wires

两根导线间的磁力

The magnetic field of an infinitely long straight wire can be obtained by applying Ampere's law. The expression for the magnetic field is

无限长直导线的磁场可通过应用安培定律获得。磁场的表达式为

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Once the magnetic field has been calculated, the magnetic force expression can be used to calculate the force. The direction is obtained from the right hand rule. Note that two wires carrying current in the same direction attract each other, and they repel if the currents are opposite in direction. The calculation below applies only to long straight wires, but is at least useful for estimating forces in the ordinary circumstances of short wires. Once you have calculated the force on wire 2, of course the force on wire 1 must be exactly the same magnitude and in the opposite direction according to Newton's third law.

一旦磁场被计算出来，就可以使用磁力表达式来计算力。方向是通过右手法则确定的。请注意，如果两根导线中的电流方向相同，它们会相互吸引；如果电流方向相反，则会相互排斥。下面的计算仅适用于长直导线，但至少可以用于估计短导线在普通情况下的力。一旦你计算出导线2上的力，根据牛顿第三定律，导线1上的力的大小必须完全相同，方向则相反。

For a current I₁ = Amperes and

对于电流 I 1 = 安培和

中文译文中的待填/计算数值依次对应：1：i。实际数值以上方原输入框为准。

radial separation between wires r = m,

导线之间的径向距离为 r = m,

中文译文中的待填/计算数值依次对应：1：r。实际数值以上方原输入框为准。

the magnetic field at wire 2 is B = Tesla =Gauss.

在导线2处的磁场是B = 特斯拉 = 高斯。

中文译文中的待填/计算数值依次对应：1：bt 2：bg。实际数值以上方原输入框为准。

If current I₂ = Amperes

若电流 I₂ = 安培

中文译文中的待填/计算数值依次对应：1：i2。实际数值以上方原输入框为准。