Electric Field Video Lessons

Concept

# Problem: 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?

###### FREE Expert Solution

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, E2 = 20 N/C

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###### Problem Details

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?