Definition: A line of force, may be defined as the continuous curve in a magnetic field, the tangent drawn at any point of which gives the direction of resultant intensity at that point.
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| Mapping of lines of force |
These lines of force may in practice be drawn by plotting successive directions pointed out by a small compass needle moving in the field.
Although the magnetic influence itself is entirely invisible, its existence and strength can be judged by such lines of force, which indicate the direction in which the magnetic influence is acting, and the density of which gives the intensity of the field at any point.
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