部分充满介质的理想螺线管条件

一般教科书中都提到，理想螺线管（指内部磁场均匀，无漏磁）的条件是无限长（相对而言），绕线蜂蜜。但对绕线是否应该均匀则未做详细论述。本文试图指出，在无介质情况下理想螺线管的绕线都是均匀的，但在部分充满介质的情况下，均匀的绕线反而会破坏“理想”的条件。

THE CONDITIONS OF A PERFECT SOLENOlD PARTLY FILLED UP WITH DIELECTRIC

In common textbooks, it is indicated that a perfect solenoid, in which magnetic field is uniform and is not disclosed, must be infinitely long and the coiling of it must be close. But whether the coiling is uniform has not been discussed. This paper shows that if a solenoid were partly filled up with dielectric, the condition? of perfection would be destroyed by uniform coiling.