- #1
lumpyduster
- 15
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Homework Statement
Verify Stokes' theorem for the given surface S and boundary dS and vector fields F
S = x2+y2+z2, z≥0
dS= x2+y2=1
F = <y,z,x>
Homework Equations
Stokes' theorem:
∫∫(∇×F)dS = ∫F⋅ds
The Attempt at a Solution
1. Curl of F:
∇×F = <-1,-1,-1>
2. After getting the curl, I just treated this as a surface integral, ∫∫F⋅dS = ∫∫F⋅(Tu×Tv)dudv
I parametrized the sphere thusly,
x = sinφcosθ
y=sinφsinθ
z=cosφ
Tφ= <cosφcosθ, cosφsinθ, -sinφ>
Tθ= <-sinφsinθ, sinφcosθ, 0>
Tφ×Tθ = <sin2φcosθ, sin2φsinθ, sinφcosθ>
Am I doing this right so far? I asked a friend what he would do, and this is what he had for dS:
<dydz, dxdz, dxdy> (Idk how to get this).
So then he got:
∫∫(∇×F)⋅dS = ∫∫(<-1, -1, -1>⋅<dydz, dxdz, dxdy>) = -∫∫dydz+dxdz+dxdy, but I don't know how to integrate that...