Potential -> electric field. Almost done, need a little help.

[frozenguy]

Potential --> electric field. Almost done, need a little help.

Homework Statement

The potential in a region between x=0 and x=6.00m is V=a+bx.
a=10[V/m]
b=-7[V/m²]
Determine a) the potential at x=0, 3m, and 6m
b.) the electric field at the same locations

Homework Equations

3. The Attempt at a Solution
So I got stuck on part b. It says along x so I disregarded y and z. Partial of V with respect to x is -b which equals 7 but the units are V/m² which doesn't seem right at all.
What did I screw up?
[

/b]

 

[ehild]

Homework Statement

The potential in a region between x=0 and x=6.00m is V=a+bx.
a=10[V/m]
b=-7[V/m²]

It was not your error. As the unit of the electric potential is V, the units for the constants are wrong: a should be in volts, and the unit of b is V/m.

ehild