# Separation vector

1. Jan 18, 2005

### starbaj12

Let c' be the separation vector from a fixed point(x'',y'',z'') to the point (x,y,z) and let c be its length. show that

Thnaks for the help

2. Jan 18, 2005

### cronxeh

3. Jun 25, 2008

### kkan2243

begin by writing 1/c in terms of cartesian coordinates.

c = sqrt[(x - x)^2 + (y - y)^2 + (z - z`)^2]
1/c = ?

then differentiate using multiple applications of the chain rule. Remember that the primed terms are constant when differentiating respect to x, y or z. This was the part that confused me at the beginning as I didn't know how to differentiate those.

4. Jun 28, 2008

### mathwizarddud

What is "hat"?

5. Jun 28, 2008

### tiny-tim

^

"hat" is ^

it means the unit vector in the direction of c'