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## Homework Statement

The plastic rod of the length L=1 m has a non-uniform charge density λ=cx where positive constant c =2x10^-6 [some unit]. What unit c has to have? Find the electric potential at the point on the x axis 1 m to the left from the left end of the rod. Find the electric field at that point via potential. What is the direction of the field

## Homework Equations

E = -dV/dx

## The Attempt at a Solution

The first two parts I've solved. For the electric field:

I've gotten:

-3.47 x 10^3 N/C

or

-1.45 x 10^4 N/C

But I'm not sure which is good. Thanks for any information :)