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Q.

**A**= (y,-x,0). Find Integral

**A**.d

**l**for a closed loop on the surface of the cylinder (x-3)^2 + y^2 = 2.

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I'm managed to ascertain the following:

*I can use Stokes' theorem to solve the problem

*The curl (

**A**) = (0,0,-2)

*Radius = sqrt2

*The normal to the cylinder, n, is equal to k (as cylinder lies in xy plane).

However, I have no clue how to do the actual surface integral! I'm fairly sure I need to transform into cylindrical coordinates, but I honestly have no idea how to use the actual 'cylinder' in the problem (is it to provide the limits?!) not how I form the integral? Please could someone offer some help. Thanks