GATE (TF) Textile 2015 Question Paper Solution | GATE/2015/TF/39

Question 39 (Textile Engineering & Fibre Science)

The normal vector to the surface z=\sqrt{x^2+y^2} at (1,1,1) is

(A)\hat{i}+\hat{j}+\hat{k}
(B)\hat{i}-\hat{j}+\hat{k}
(C)-\hat{i}-\hat{j}+\hat{k}
(D)-\hat{i}+\hat{j}+\hat{k}
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