Write some important characteristics of electric field lines

Important characteristics of electric field lines:
(i) A tangent to a field line gives the direction of

\(\begin{array}{l}overrightarrow{E}\end{array} \)
at that point. In fig
\(\begin{array}{l}overrightarrow{E_1}\end{array} \)
is electric field at P1 and
\(\begin{array}{l}overrightarrow{E_2}\end{array} \)
is a P2.
(ii) The direction in which a free unit positive charge moves is the positive direction of the electric field line.
(iii) The number of field lines linked with a unit area of cross-section is proportional to E.

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