By analyzing the structure of longitudinal magnetic field of vacuum interrupter, a practical mathematical model of longitudinal magneticcontact is established and applied.
Power is transferred to each device by direct contact rather than via a magnetic field and induction.
这样就能直接给设备供电，无需借助磁场和感应电流。
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Personal Electronics: a magnetic resonance system could allow contact-free recharging-for example, a cellphone battery could be boosted from anywhere in a room.