Magnetic Field of Current

The magnetic field lines around a long wire which carries an electric current form concentric circles around the wire. The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of your right hand would curl if you wrapped them around the wire with your thumb in the direction of the current.

Magnetic Field of Current

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 Show 显示 For a current I = Amperes and 对于电流 I = 安培斯和 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 distance r = m, 径向距离 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 is B = Tesla = Gauss B = x10^Tesla = x10^ Gauss. 磁场是 B = 特斯拉 = 高斯 B = x10^ 特斯拉 = x10^ 高斯。 中文译文中的待填/计算数值依次对应：1：bt 2：bg 3：btb 4：btp 5：bgb 6：bgp。实际数值以上方原输入框为准。 The earth's magnetic field is about 0.5 gauss. The permeability of free space is 地球的磁场约为0.5高斯。自由空间的磁导率是

Magnetic Field of Current

The magnetic field of an infinitely long straight wire can be obtained by applying Ampere's law. Ampere's law takes the form 无限长直导线的磁场可通过应用安培定律获得。安培定律的形式为 and for a circular path centered on the wire, the magnetic field is everywhere parallel to the path. The summation then becomes just 对于以导线为中心的圆形路径，磁场在路径上的每个点都与路径平行。因此，求和就变得很简单。 The constant μ0 is the permeability of free space. 常数μ₀是真空中的磁导率。 Calculation 计算