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 [latex]overrightarrow{E}[/latex]at that point. In fig [latex]overrightarrow{E_1}[/latex] is electric field at P1 and [latex]overrightarrow{E_2}[/latex]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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