The coefficient of mutual inductance of two circuits \( \mathrm{A} \) and \( \mathrm{B} \) is \(....

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The coefficient of mutual inductance of two circuits
\( \mathrm{P} \)
\( \mathrm{A} \) and \( \mathrm{B} \) is \( 3 \mathrm{mH} \) and their respective resistances are 10 and \( 4 \Omega \). How much current should change in \( 0.02 \mathrm{~s} \) in circuit \( \mathrm{A} \), so that the induced current in \( \mathrm{B} \) should be \( 0.0060 \mathrm{~A} \) ?
(1) \( \quad 0.24 \mathrm{~A} \)
(2) \( \quad 1.6 \mathrm{~A} \)
(3) \( 0.18 \mathrm{~A} \)
(4) \( 0.16 \mathrm{~A} \)


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