(30) A thin insulating rod, extending from z = -a to z = +a, carries a linear charge density as indicated below. In each case, find the lowest order multipole moment and express its associated potential V($\vec{r}$) in spherical coordinates (r, $\theta$, $\phi$). (a)? = ??|z| (b)? = ??z (c)? = ??(1 - \frac{2|z|}{a})
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From the equation, we know that V is a function of z and a. We can use the substitution z=a to solve for V. Show more…
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