耦合电感模型下，如果不考虑弹丸运动的影响，那这个系统是完全线性的，即弹丸电流I2会和线圈电流I1严格成正比，就是：
若I1=a(t)时，I2=b(t)。则I1=k*a(t)时，I2=k*b(t)。（k为任意实数；a，b等是电流关于时间的函数）
若I1=a时，I2=b；I1=c时，I2=d。则I1=a+c时，I2=b+d
所以此时电磁力的大小，是严格和线圈电流的平方成正比的。
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