It tells you that you cannot get energy for free out of your forcefield.
就意味着你不可能在力场里面无偿地得到能量。
2
When the magnetic field deviates from potential or force-freefield, 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。
3
Using the multistep implicit scheme, a numerical study was made to reveal the influence of linear force-freefield to the spontaneous reconnection of current sheets.