hi..i really need some help. we have that alpha(x,y,x) = 1/r , where r^= x^2 + y^2 + z^2(adsbygoogle = window.adsbygoogle || []).push({});

and where the fector field F = nabla alpha (gradient of alpha)

i calculated F to be :

(-xx^ + yy^+zz^)/r^3

but iam supposed to calculate the flux integral

I_s F*n dS

but i dont know how to find the normal vector n. can anyone help me with that?

(you dont need to calculate it, i just need hints of how i can find it.)

PS ..s is a area without the point (0,0,0)

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# I really need some help.

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