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Homework Statement
I want to show that:
Grad dot product with r = 2/r
where:
r is the unit vector r/r
r = xi + yj + zk
r is magnitude of r
The Attempt at a Solution
I think the answer should be 3/r
since unit vector r = r/r,
r = (x/r)i + (y/r)j + (z/r)k
then when I do grad dot r I should get (1/r) + (1/r) + (1/r) = (3/r)
what do you think?