# Divergence of unit vector r(hat)?

r=xi+yj+zk

(r, i, j, and k are vectors)

Evaluate Del ( r/ |r| )

The answer should be 2/r but I cannot get it.

Any help is appreciated!

(r, i, j, and k are vectors)

Evaluate Del ( r/ |r| )

The answer should be 2/r but I cannot get it.

Any help is appreciated!

Update:
2/r is the answer in the back of the book.

Since ( r / |r| ) is the unit vector r(hat), x, y, and j would each equal 1.

So r(hat) = i+j+k

When I take partial derivatives with respect to x, y, and z respectively, I should get 0 for everything. But the answer is 2 / r.

Since ( r / |r| ) is the unit vector r(hat), x, y, and j would each equal 1.

So r(hat) = i+j+k

When I take partial derivatives with respect to x, y, and z respectively, I should get 0 for everything. But the answer is 2 / r.

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