Question: A thin insulating rod, running from z = a to z = + a, carries the indicated line charges. In each case, find the

A thin insulating rod, running from z = – a to z = + a, carries the indicated line charges. In each case, find the leading term in the multipole expansion of the potential:

(a) λ = k cos(πz/2a),

(b) λ = k sin(πz/a),

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