- #1

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He says that he's used integration by parts but I cant see how he got rid of the first term (the one that involves integrals only) when integrating by parts.

Regards

- Thread starter shehry1
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- #1

- 44

- 0

He says that he's used integration by parts but I cant see how he got rid of the first term (the one that involves integrals only) when integrating by parts.

Regards

- #2

gabbagabbahey

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The [tex]\int \mathbf{\nabla}' \cdot \frac{\mathbf{J}(\mathbf{x}')}{|\mathbf{x}-\mathbf{x}'|} d^3x'[/tex] term can be transformed to a surface integral using the divergence theorem, and since the boundary of all space is at [tex]x' \to \infty[/tex] the integrand of that term is zero leaving you with equation 5.21

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