Induction loop
（重定向自Inductive loop）
![An example of the Inductance loop installed in the road for cars and bikes](/Images/godic/202501/20/Inductance_detectors1545.jpg")
![Schematic of such a detector](/Images/godic/202501/20/Inductive_loop_detector1545.gif")
An induction or inductive loop is an electromagnetic communication or detection system which uses a moving magnet to induce an electric current in a nearby wire. Induction loops are used for transmission and reception of communication signals, or for detection of metal objects in metal detectors or vehicle presence indicators. A common modern use for induction loops is to provide hearing assistance to hearing-aid users.