11. However, his basic formulation does not involve detailed electromagnetic theory. 12. Currently, the interactions of elementary particles and electromagnetic fundamental forces. 13. For the electromagnetic field, this gauge symmetry is the Lagrangian. 14. Successful EMI control with effective susceptibility control leads to electromagnetic compatibility. 15. See electromagnetic wave equation for a discussion of this important discovery. 16. Yamaha, electromagnetic pickups attached to the instrument's frame. 17. The fires prompted an investigation by scientists from the electromagnetic emissions. 18. Government research on urban maglev using electromagnetic suspension began in 1994. 19. As with electromagnetic waves, sonic waves can exhibit negative refraction. 20. Standard electromagnetic induction utility locating tools require utilities to be conductive.