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## Homework Statement

The electric potential along the x-axis is V=100e^(−2x/m), where x is in meters.

Find Ex at x=1.0m and Ex at x=2.1m

## Homework Equations

V=Ed

Ex = dV/dx (?)

## The Attempt at a Solution

I took the derivative of V and got (-200/m)e^(-2x/m)

I don't know what m is and I'm just not sure how I can get an integer value for Ex at x=1.0m and 2.1m

EDIT===

I assumed m=1 and got the correct answer, don't understand what m is though