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- Thread starter tsang
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G01

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[tex]\int \rho(\vec{x})\,\vec{x}\,d^3x[/tex]

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[tex]\int \rho(\vec{x})\,\vec{x}\,d^3x[/tex]

Hi friend, may I ask you to explain details please? I never seen this formula before, and I have no idea how to use it. Could you please give me a simple example? For example, I saw a question talks about the dipole moment for three metal balls which are connected on three coners of a equalateral triangle. How to use that formula to solve this question? Thanks a lot.

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G01

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[tex]\vec{p}=\sum_i q_i \vec{x_i}=q_1\vec{x_1}+q_2\vec{x_2}+q_3\vec{x_3}+...[/tex]

Here, [itex]\vec{x_i}[/itex] is the distance vector vector the ith charge from the origin.

Thus you need to compute the distances of each charge from your chosen origin, and then compute the above vector sum.

Beyond this, you'll need to show some work for more help, as this is sounding like a homework question.

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