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# What are the properties of lines of forces ?

What are the properties of lines of forces ?

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A)
(i) Lines of force start from positive charge and terminate at negative
charge.
(ii) Lines of force never intersect.
(iii) The tangent to a line of force at any point gives the direction of
the electric field (E) at that point.
(iv) The number of lines per unit area, through a plane at right angles
to the lines, is proportional to the magnitude of E. This means
that, where the lines of force are close together, E is large and
where they are far apart, E is small.
(v) Each unit positive charge gives rise to $\frac{1}{\epsilon}$ lines of force in free space. Hence number of lines of force originating from a point
charge q is N = $\frac{q}{\epsilon}$ in free space
(v1) Test.