验证近场平面上之电场影像呈现直线电流之两极。
Verfy that the E-field intensity image in the near field shows the two poles of the line current.
他发明的装置运转起来就像一台典型的直线发动机。在装置内，磁铁在线圈内上下移动从而产生电流。
His invention works much like a typical linear generator, in which a magnet is moved up and down inside coils of wire, inducing electrical currents in the process.
相对的，在由金属直线所组成的晶格中，电场会引发来回流动的电流。
In a lattice of straight metal wires, in contrast, an electric field induces back-and-forth currents.
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