Multiple choice

The direction of vector A is radially outward from the origin, with |A| = k rⁿ where r² = x² + y² + z² and k is constant. The value of n for $\nabla$. A = 0 is

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The direction of vector A is radially outward from the origin, with |A| = k rn where r2 = x2 + y2 + z2 and k is constant. The value of n for $\nabla$. A = 0 is