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由经典观点出发，利用麦克斯韦著名假设之一，变化电场产生变化磁场，导出运动电荷的磁场计算公式，进而推导了毕奥－萨伐尔－拉普拉斯定律
From a classical point of view, using one of Maxwell’s well-known assumptions, a changing magnetic field is generated by changing the electric field to derive a magnetic field calculation formula for the kinetic charge, which leads to Biot-Savart-Laplace’s law