The electric field due to a uniformly charged wire is expressed as:

$\overline{){\mathbf{E}}{\mathbf{=}}\frac{\mathbf{\lambda}}{\mathbf{2}\mathbf{\pi}\mathbf{\epsilon}\mathbf{r}}}$

Here, λ is the charge per unit length, r is the distance of a point from the wire.

We're given that at r = 2 cm, E_{2} = 20 N/C

Charge is distributed uniformly along a long straight wire. The electric field 2 cm from the wire is 20 N/C. The electric field 4 cm from the wire is?

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