Question: Let r = x i + y j + z k and r = |r|. (a) r = r/r (b) x r = 0

Let r = x i + y j + z k and r = |r|.

(a) ∇r = r/r

(b) ∇ x r = 0

(c) ∇ x (1/r) = - r/r3

(d) ∇ In r = r/r2

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