It tells you that you cannot get energy for free out of your force field.
就意味着你不可能在力场里面无偿地得到能量。
When the magnetic field deviates from potential or force-free field, the field-aligned current can be produced, and it relates closely with the intensity and lifetime of ducts.
当磁场偏离势场或无力场时，将会产生场向电流，该电流与导管的强度和稳定维持密切相关。
Using the multistep implicit scheme, a numerical study was made to reveal the influence of linear force-free field to the spontaneous reconnection of current sheets.
采用二维三分量磁流体力学数值模拟方法，研究了线性无力场对电流片的自发重联的影响。
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