Originally Posted by **chevy900ss** enot = 8.85x10^-12 C^2/Nm^2 |

Ok, then no... the formula you wrote is not the good one.

What r would you choose?

Instead, d

**E**=(kdQ)/r³

**r **where the bold letters represent vectors.

You have to integrate dE from r=5 to r=9. (why? Because r=9 is the distance between x=10m to x=1m and r=5 is the distance between x=5 to x=10.)

I'll help you a bit more... what is dQ, that is, the charge of a very small (differential in fact, of length dx) element of the charged line?