Line-of-force meaning

A theoretical line in a field of force, such that a tangent at any point gives the direction of the field at that point.
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A line in a field of electrical or magnetic force that indicates the direction taken by the force at any point.
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A line used to indicate the direction of a field, especially an electric or magnetic field, at various points in space. The tangent of a line of force at each point indicates the orientation of the field at that point. Arrows are usually used to indicate the direction of the force.
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(physics) An imaginary line in a field of force, whose tangent at any point gives the direction of the field at that point and whose number through unit area perpendicular to the field represents its intensity.
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