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Why do we use rise over run(I.e. tangent) only to determine the direction? Why not anything else? Is it simply because of ease of calculation OR convention?

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By definition the direction of the tangent to a electric field line at a point (taking account of the direction of the arrowhead) is the direction of the electric field at that point.

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  • $\begingroup$ Why has this definition be chosen? $\endgroup$ – Poorvaja Jain Mar 29 at 11:15
  • $\begingroup$ Because it produces a very useful visual representation of the electric field. $\endgroup$ – Farcher Mar 29 at 13:28

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