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Field lines
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Faraday introduced a way to describe an electric field you can introduce the concept of field line. These are defined as a tangential line to the electric field vectors.
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Construction of field lines
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Field lines are a way of making visible the electric field that arises with different charges. For this, a point is considered in the space
$\displaystyle\frac{\vec{E}(\vec{x}_0)}{\mid\vec{E}(\vec{x}_0)\mid}$
With this address a
$\vec{x}_1=\vec{x}_0+\displaystyle\frac{\vec{E}(\vec{x}_0)}{\mid\vec{E}(\vec{x}_0)\mid}ds$
what is shown in the following graph:
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