The switch \( \mathrm{S} \) shown in figure is kept closed for a long time and then opened at \(....

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The switch \( \mathrm{S} \) shown in figure is kept closed for a
\( \mathrm{P} \)
long time and then opened at \( \mathrm{t}=0 \), then the current in the middle \( 20 \Omega \) resistance at \( \mathrm{t}=0.25 \mathrm{~ms} \) is :
(1) \( 0.629 \mathrm{~A} \)
(2) \( 0.489 \mathrm{~A} \)
(3) \( \quad 0.189 \mathrm{~A} \)
(4) \( 23 \mathrm{~A} \)


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