Example 41: value of the circulation of tihe ficld f =-xyi +y'j+-x')k around the curve c, where cis the intersection ofthe sphere +y+z = 25 and the plane z =4 a

Example 41: Value of the circulation of tihe ficld F =-xyi +y'j+-x')k around the curve C, where Cis the intersection ofthe sphere +y+z = 25 and the plane z =4 and is oriented counterclock WISe, is 817 (d) 81T (b) -817 4 4 (a) 81r