I have a problem on my homework that is really confusing. I need to solve the partial differential equation in a spherical shell with inner radius = a and outer radius=b: (Laplacian u)=1 in spherical coordinates. The boundary conditions are u=0 on the inner radius r=a, and du/dr=0 on outer radius r=b. The part that is really confusing is that the (Laplacian u)=1 not zero which doesn't make since to me physically. I can't use seperation of variables because the PDE is inhomogeneous. I am really confused, would someone help me please?(adsbygoogle = window.adsbygoogle || []).push({});

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# Laplacian in Spherical Shell

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