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The direction of vector A is radially outward from the origin...

This question belongs to Engineering Maths Calculus
Calculus
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The direction of vector A is radially outward from the origin, with |A| = krn where r2 = x2 + y2 + z2 and k is a constant. The value of n for which $$\nabla \cdot {\text{A}} = 0$$   is

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Correct Answer: Option A
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