Chemical Engineering > GATE 2015 > Vector Calculus
A scalar function in the xy-plane is given by φ(x, y) = x² + y². If î and ĵ are unit vectors in the x and y directions, the direction of maximum increase in the value of φ at (1,1) is along
A
-2î+2ĵ
B
2î+2ĵ
C
-2î-2ĵ
D
2î-2ĵ

Correct : b

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