Search coil by computer to determine displacement in multiple dimensions. Additionally, a second search coil can be added to measure torsional rotation. A more crude search coil also called exploring coil is also used in laboratory experiments in schools to measure the magnetic field in a certain region of space. In this case the search coil consists of a simple wire coil or solenoid connected to a sensitive ammeter or galvanometer. The coil is placed in the magnetic field to be measured and quickly withdrawn to a region of space with a negligible magnetic field. As the search coil moves the magnetic
Induction coil radio transmitters, arc lighting and quack medical electrotherapy devices from the 1880s to the 1920s. Today its only common use is as the ignition coils in internal combustion engines and in physics education to demonstrate induction. An induction coil consists of two coils of insulated wire wound around a common iron core "(M)". One coil, called the "primary winding" "(P)", is made from relatively few (tens or hundreds) turns of coarse wire. The other coil, the "secondary winding," "(S)" typically consists of many (thousands) turns of fine wire. An electric current is passed through the primary, creating a magnetic field.