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Old Jun 18th 2017, 12:30 PM   #1
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Problems understanding video clip on electric dipole



In this video on electromagnetism from about 18:20 the lecturer derives the potential on a dipole. In deriving an approximation for large distances from dipole he makes a step (at about 20:50) I can't fathom. It looks similar to a MacClurin series but I'm not seeing how he got the q/(4*pi*eps0*r^2*(1+a/r+a^2/r^2 +...) expression. Can anyone else see it?
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Old Jun 18th 2017, 11:00 PM   #2
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Looks like I misread it, not an infinite series expansion, just a rearrangement of terms.
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