Question

Δ
x (vector r/r^3)
is equal to​

Answer 1

Step-by-step explanation:

The gradient of 1r (noting that r=x2+y2+z2−−−−−−−−−−√) is

∇1r=−rr3

when r≠0, where r=xi+yj+zk. Now, the divergence of this is

∇⋅(−rr3)=0