但如果有另一个和它缠绕在一起的金属线圈。
But now you have another loops of wire that is intertwined with it.
我们的设计及建造高品质的金属线圈加工生产线。
We design and build high quality metal coil processing line.
用电流产生磁场容易：当电流在金属线圈流动时，磁场也随之产生。
Creating a magnetic field using electricity is easy: an electric current flowing in a wire generates a magnetic field around that wire.
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