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Asked in GSEB Board March 2022 · Electric field lines
Idea: field lines are drawn so that a small positive test charge placed on one would be pushed along it.
At every point the tangent to the line points along ⃗E there; that is how the lines are constructed.
The magnitude is shown separately, by the density of lines: where they crowd together the field is strong, where they spread out it is weak.
This is also why two field lines never cross: at a crossing the field would have two directions at one point.
So the tangent gives the direction of the electric field.
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