I. 12.12 Vector Field Circulation

Condition: Calculate the circulation of the vector field \ (\ vec {a} = p (x, y) \ vec {\ iMath}+q (x, y) \ vec {\ jmath} \ quad \) along the closed circuit \ (l \), lying in the plane \ (x o y \) (bypass counterclockwise). \ (\ vec {a} = 2 \ vec {\ iMath}-(y+1) \ vec {\ jmath}, \ quad l: \ quad \) parallelograms \ (\ quad \) with peaks at points \ (2.0), b (0.2), C (-5.2)) \), \ (D (-3,0) \)