Finally, based on the principles of the induced electromotive force, increase the number of induction coil element in order to get n finite-length multi-layer solenoid coil inductance element in series, linking and reverse the formula. 最后,根据感应电动势的原理,通过增加感应线圈元的数量进一步得到了n个有限长多层螺线圈元串联顺接电感的计算公式。