Without using vector identities, prove that: (a) f (r r) = (r r).
Question:
Without using vector identities, prove that:
(a) ∇f (r − r’) = −∇’ ∫ (r − r).
(b) ∇ · [A(r) × r] = 0.
(c) dQ = (ds · ∇)Q where dQ is a differential change in Q and ds is an element of arc length.
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