本文以一个无限大的超导平板为例,分析它在正弦外磁场作用下处于Meissner态时的电磁场以及能量变化的特征,计算结果表明在准静态外磁场作用下超导体内的磁场、电场以及感应电流都随着透入表面的深度迅速衰减而没有滞后现象.根据超导电流和穿透深度的定义以及London方程,分析了超导体内超导电流与感应电场乘积的物理意义.我们计算并分析了流入超导体的电磁能与内部的磁场能、电场能、超导电子动能之间的转化关系,结果表明这四种能量之间的转化是完全可逆的,超导体内不存在任何损耗.
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