We have that the straight electric field line is supposed to represent a constant electric field because the electric field is uniform.
Uniform electric field
Generally the equation for the electric field due to a line charge is is mathematically given as
[tex]E=\frac{2k\lambda}{r}[/tex]
An electric field defines a region around a charge in where a variant charge particle experiences a force.
The electric field strength is given by force experienced by per unit charge.
A line charge produces a uniform electric field .
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