Multipole expansions, calculating the various moments of point charges

milkism
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Homework Statement
Calculate the mono-di and quadrupole moments of the three charges.
Relevant Equations
See solution.
Problem:
a7a1f4ebf284a13000ba8221226cc7b1.png

Solution:
8abe8f08e8a11148085faa3cf6807ad7.png

This was quite simple, are my solutions correct?
 
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Likes vanhees71, hutchphd and PhDeezNutz
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Looks very good to me.
 
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Likes PhDeezNutz and milkism
I love your explanations and motivations. Very thorough.
 

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