NOTE: r and k are vectors

The electric field E of a dipole with moment k located at the origin is given by

E(r) = (3zr/||r||⁵) − (k/||r||³)

a) Compute div E.

I understand ||r|| = √x² + y ² + z² but the k is confusing me..please help..

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- Apr 13th 2013, 11:11 PMSA2392calc 3: need help computing div E
**NOTE: r and k are vectors**

The electric field E of a dipole with moment k located at the origin is given by

E(r) = (3zr/||r||⁵) − (k/||r||³)

a) Compute div E.

I understand ||r|| = √x² + y ² + z² but the k is confusing me..please help..