力的冲量大小等于力的大小与力作用时间的乘积。如果力是变力,则力的大小应为该变力的平均值。在有些电磁感应现象中,电路中产生的感应电流往往是随时间非线性变化的,因而电路中的某段导体受到的磁场力(安培力)也是随时间非线性变化的,一般 The impulse force of force is equal to the product of force and force. If the force is variable, then the magnitude of the force should be the average of the force. In some electromagnetic induction phenomena, the induced current in the circuit tends to change nonlinearly with time, so the magnetic field force (Ampere) of certain conductor in the circuit also changes nonlinearly with time, and generally