Expand the potential
ConsiderX, Y, Z as constants and expand
If we split the 2xy term into xy and yx (and similarly for the 2xz and 2yz terms), we have the nine components of a 2nd-rank tensor called the quadrupole moment. Use the "direct product" method of Chapter 10, Section 2 to show that it is a 2nd–rank tensor. (Remember from Chapter 10 that, by definition, x, y, z are the components of a
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