他们指出，电场将被限制在天花板附近，因而只有磁场可将电能传送至几米开外的一个更小的接收线圈。
They showed that the electric field is confined near the ceiling, leaving only the magnetic field to transfer the energy to a smaller receiving loop a few metres away.
充电装置由线圈和电容板组合而成，通电后会产生一个特定频率的共振磁场。
The charging device, made of a coiled wire with capacitance plates on either end, uses electricity to create a magnetic field that resonates at a specific frequency.
这个盒子内部具有磁场，刻有遇难者名字的金属板可以自由地漂浮在上方。
The box contains the names of all the victims inscribed on metal pieces that freely float in a magnetic field inside.
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