For each of the vector field below, decide whether they have a nonzero curl at the point marked. Each vector field is shown in the -plane, has no -component and is independent of . Note that the vector fields are shown with a dot at the tail of each vector.
graph of the first vector fieldgraph of the second vector fieldgraph of the third vector field
(a)(b)(c)
Vector field (a) has curl at the marked point.
Vector field (b) has curl at the marked point.
Vector field (c) has curl at the marked point.

You can earn partial credit on this problem.