1. 位移電流不承受電荷力的作用可能導致動量不守恒. (references?)
2. 很多物理學家避之惟恐不及,這朵烏雲從19世紀一直飄到21世紀.(references?)
To my knowledge, 光在介質中特別是在透明介質中的動量仍然是個謎. See: Weilong She, Jianhui Yu, and Raohui Feng, "Observation of a Push Force on the End Face of a Nanometer Silica Filament Exerted by Outgoing Light," Phys. Rev. Lett. 101, 243601 (2008).
Thanks a lot.