In figure, there is a conducting loop \( A B C D E F \) of resistance \( \lambda \) per unit len...

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In figure, there is a conducting loop \( A B C D E F \) of resistance \( \lambda \) per unit length placed near a long straight current-carrying wire. The dimensions are shown in the figure. The long wire lies in the plane of the loop. The current in the long wire varies as \( I=I_{0}(t) \).
The emf induced in the closed loop is
(1) \( \frac{\mu_{0} I_{0} a}{2 \pi} \ln \left(\frac{2 a+l}{l}\right) \)
(2) \( \frac{\mu_{0} I_{0} a}{2 \pi} \ln \left(\frac{2 a-l}{l}\right) \)
(3) \( \frac{2 \mu_{0} I_{0} a}{\pi} \ln \left(\frac{a+l}{l}\right) \)
(4) \( \frac{\mu_{0} I_{0} a}{\pi} \ln \left(\frac{a+l}{l}\right) \)
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