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[" (39) In an inductor of self-inductanc...

[" (39) In an inductor of self-inductance "L=2mH" ,current change "],[" with time according to relation: "],[I=t^(2)e^(-t)" .At what time emf is zero? "],[[" (a) "4s," (b) "3s],[" (e) "2s," (d) "1s]]

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