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 \(overrightarrow{E}\)at that point. In fig \(overrightarrow{E_1}\) is electric field at P1 and \(overrightarrow{E_2}\)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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