Current \( I \) flows through the circuit, as shown in figure. Find the magnetic moment of the f...

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Current \( I \) flows through the circuit, as shown in figure. Find the magnetic moment of the figure, if \( A B=B C=C D=D E \) \( =E F=F G=G H=H A \).
(1) \( \frac{7}{2} I \pi a^{2} \)
(2) \( \frac{5}{2} I \pi a^{2} \)
(3) \( 4 I \pi a^{2} \)
(4) \( \frac{5}{3} I \pi a^{2} \)
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