What is the mutual inductance of a two-loop system as shown with centre separation l ?

\[\frac{\mu_{0}\pi a^{4}}{8l^{3}}\]
\[\frac{\mu_{0}\pi a^{4}}{4l^{3}}\]
\[\frac{\mu_{0}\pi a^{4}}{6l^{3}}\]
\[\frac{\mu_{0}\pi a^{4}}{2l^{3}}\]
No solution provided for this question.
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