1. For each vector field F = (P, Q) shown, aQ OP aQ OP ay is not equal to zero. Which field has ax > 0? ay A. B. C. y 2. For each vector field F shown, the divergence is a nonzero function. For which is the divergence always positive? A. B. C.6. Consider F = (as, my, myz). Does there exist a vector eld G such that curl G = F? Why or Why not? 7. The gures show four congruent squares 8k in space. Rank the surface integrals [k = f] :10 d8. Explain. 5k (An example of a sample answer: I1