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. (5 Points) Consider a quadrupole with charges +q(t) = go cos(wt) at positions ±d/ and then charge-2q(t) =-20 cos(wt) at the origin. (a) Verify that the potential is: R+ R. Use the approximations in Sec. 11.1.2 to first order in d to show that the potential is zero to first order in d. (b)
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