Line of force Meaning, Definition & Usage
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noun an imaginary line in a field of force; direction of the line at any point is the direction of the force at that point
field line.
WordNet
Definitions
(Physics) , any line in a space in which forces are acting, so drawn that at every point of the line its tangent is the direction of the resultant of all the forces. It cuts at right angles every equipotential surface which it meets. Specifically(Magnetism) , a line in proximity to a magnet so drawn that any point in it is tangential with the direction of a short compass needle held at that point. Faraday.