electronic surveillance
- n surveillance by electronic means (e.g. television)
electromagnet
- n a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet
electromagnetic delay line
- n a delay line based on the time of propagation of electromagnetic waves
electromagnetic interaction
- n an interaction between charged elementary particles that is intermediate in strength between the strong and weak interactions; mediated by photons
electromagnetic intrusion
- n the deliberate insertion of electromagnetic energy into transmission paths with the objective of confusing or deceiving operators