When current changes from \( 13 \mathrm{~A} \) to \( 7 \mathrm{~A} \) in \( 0.5 \) s through a c...

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When current changes from \( 13 \mathrm{~A} \) to \( 7 \mathrm{~A} \) in \( 0.5 \) s through a coil, the emf induced is \( 3 \times 10^{-4} \mathrm{~V} \). The coefficient of self induction is:
(A) \( 25 \times 10^{-6} \mathrm{H} \)
(B) \( 25 \times 10^{-5} \mathrm{H} \)
(C) \( 25 \times 10^{-4} \mathrm{H} \)
(D) \( 25 \times 10^{-3} \mathrm{H} \)
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