- #1

Ashley1nOnly

- 132

- 3

## Homework Statement

F(x) has the form F(x)=f(r)x where r=|x|

A.) prove that del cross f =0

B.) Now suppose also Del •F = O. What is the most general form allowed for f(r)?

## Homework Equations

## The Attempt at a Solution

I have done part b but what do I need for A

F(X)= r(hat)

Fr = 1, F(theta) = F(phi)= O.

Got this out of book.

Using equation from the book ( del cross F) r

I get zero.

But what is the proof behind it

Have my answer for part a uploaded