# Homework Help: What is a Small Number?

1. Oct 17, 2011

### BraedenP

What is a "Small" Number?

1. The problem statement, all variables and given/known data

I am given the equation, and asked to find an approximation (using Taylor's Formula):
$$E=\frac{q}{z^2(1-d/z)^2}-\frac{q}{z^2(1+d/z)^2}$$
I am also told that I can assume "z is much larger than d, so d/z is small."

Does this mean that I can assume d/z = 0? This seems to be what that quote is suggesting.

Is this what it's referring to?

2. Relevant equations

3. The attempt at a solution