Question

If $\vec{F} = (x+2y+az)\hat{i} + (bx −3y-z)\hat{j}+(4x+cy+2z)\hat{k}$ is irrotational, where a, b and c are constant, then a2 + b2 + c2 is equal to :

• A. 5
• B. 7
• C. 19
• D. 21

Answer 1

Answer: (D)

21

Answer 2

The correct option is(D):21.