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1. The magnetic field is responsible for the movement of electrons in the circuit.
磁场负责电路中电子的运动。
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2. The strength of the magnetic field depends on the distance between the north and south poles.
磁场的强度取决于南北极之间的距离。
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3. The magnetic field can be used to detect the presence of magnetic materials.
磁场可以用来检测磁性材料的存在。