Electric field from very long wire

[Eats Dirt]

Homework Statement

A very long straight wire has a charge of 1.5 * 10^-10 C/m. at what distance from the wire is the electric field magnitude equal to 2.5 N/C

Homework Equations

I was thinking about intergrating the electric field?

The Attempt at a Solution

the thing I am having a problem with if i attempt to integrate the field is from which point to which point to integrate to? negative infinite to infinite? like usually i just do this with algebra and no number to solve for say to integrate the field from -a to a but in the end A is still in the equation.

 

[SammyS]

Homework Statement

A very long straight wire has a charge of 1.5 * 10^-10 C/m. at what distance from the wire is the electric field magnitude equal to 2.5 N/C

Homework Equations

I was thinking about integrating the electric field?

The Attempt at a Solution

the thing I am having a problem with if i attempt to integrate the field is from which point to which point to integrate to? negative infinite to infinite? like usually i just do this with algebra and no number to solve for say to integrate the field from -a to a but in the end A is still in the equation.

Do you know Gauss's Law ?