Field (video), one half of a frame in an interlaced display; Field coil, of an electric motor or generator; Field experiment; Field magnet, a magnet used to produce a magnetic field; Field research or fieldwork, the collection of information outside a laboratory, library or workplace setting; Field of heliostats, an assembly of heliostats ...
A field line for that vector field may be constructed by starting at a point and tracing a line through space that follows the direction of the vector field, by making the field line tangent to the field vector at each point. A field line is usually shown as a directed line segment, with an arrow indicating the direction of the vector field ...