Example 41: value of the circulation of the ficld f =-yi + yj +-*)k around the curve c, where cis the intersection ofthe sphere r+y+z* =25 and the plane z = 4 a

Example 41: Value of the circulation of the ficld F =-yi + yj +-*)k around the curve C, where Cis the intersection ofthe sphere r+y+z* =25 and the plane z = 4 and is oriented counterclock WiSe, is 8177 (d) AA 81 T (a) 81r (b) -81 z () 4 4