SHANGHAI JUJIN INTERNATIONAL CO., LTD.

The Current and The Magnetic Field

Details
Based on the principle that magnetic field can be generated by switching on the coil. When the principle works,the compass will deflect. The coil made of 6 circles enameled wire.It can work  using  instrument or the battery. Acrylic shell, non-magnetic screw of stainless steel, adjustable circles.

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