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在直导线两端各焊接1根柔软导线,并让2根直导线在竖直板面上平行地吊挂起来,设计、制作成“同向电流相互吸引、异向电流相互排斥”的演示装置.
Welding one flexible wire at each end of the straight wire and letting two straight wires hang up in parallel on the vertical plate, designed and made into “mutual attraction of current in the same direction and mutual exclusion of different currents”. Demo device.