Question #164438

Show that potential function U= x2+y2+2z2 satisfies Laplace equation


1
Expert's answer
2021-02-17T14:43:27-0500

2U=2Ux2+2Uy2+2Uz2=0,\nabla^2U=\frac{\partial^2U}{\partial x^2}+\frac{\partial^2U}{\partial y^2}+\frac{\partial^2U}{\partial z^2}=0,

Ux=2x,\frac{\partial U}{\partial x}=2x, Uy=2y,\frac{\partial U}{\partial y}=2y, Uz=4z,\frac{\partial U}{\partial z}=4z,

2Ux2=2,\frac{\partial^2U}{\partial x^2}=2, 2Uy2=2,\frac{\partial^2U}{\partial y^2}=2, 2Uz2=4,\frac{\partial^2U}{\partial z^2}=4,

2U=2+2+4=80,\nabla^2U=2+2+4=8 \not =0,

function U does not satisfy Laplace equation.


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