- #1
maria clara
- 58
- 0
Hello,
I don't fully understand the meaning of Green function, and how one should use it. According to Jackson's "Classical Electrodynamics" - 'the method of images is a physical equivalent of the determination of the appropriate F(x, x') to satisfy the boundary conditions'.
Where Green function is: G(x, x') =1/|x-x'| + F(x, x').
moreover, 'the variable x' refers to the location P' of the unit source, while the variable x is the point P at which the potential is being evaluated'.
For example, given that the potential is zero on an infinite plane, apart from a disk of radius a where the potential is constant, V, what is the appropriate Green function?
The answer is [(x-x')2+(y-y')2 +(z-z')2]-0.5 - [(x-x')2+(y-y')2 +(z+z')2]-0.5
according to the method of images, I think there should be two charges, Q and -Q, symmetrically situated above and below the plane. I believe that this is exatly what the above mentioned Green function describes, but here is what I don't understand:
If the Green function should describe the two charges, then the coordinates x', y' and z' should be constans. But eventually, they are variables of integration...
This is truly confusing, could someone please clarify this point for me?
Thanks! :-)
I don't fully understand the meaning of Green function, and how one should use it. According to Jackson's "Classical Electrodynamics" - 'the method of images is a physical equivalent of the determination of the appropriate F(x, x') to satisfy the boundary conditions'.
Where Green function is: G(x, x') =1/|x-x'| + F(x, x').
moreover, 'the variable x' refers to the location P' of the unit source, while the variable x is the point P at which the potential is being evaluated'.
For example, given that the potential is zero on an infinite plane, apart from a disk of radius a where the potential is constant, V, what is the appropriate Green function?
The answer is [(x-x')2+(y-y')2 +(z-z')2]-0.5 - [(x-x')2+(y-y')2 +(z+z')2]-0.5
according to the method of images, I think there should be two charges, Q and -Q, symmetrically situated above and below the plane. I believe that this is exatly what the above mentioned Green function describes, but here is what I don't understand:
If the Green function should describe the two charges, then the coordinates x', y' and z' should be constans. But eventually, they are variables of integration...
This is truly confusing, could someone please clarify this point for me?
Thanks! :-)