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[" The time constant of an inductance is...

[" The time constant of an inductance is "2times10^(-3)s" ."],[" When a "90Omega" resistance is joined in series,the time "],[" constant becomes "0.5times10^(-3)s" .The inductance and "],[" resistance of coil are :- "],[[" (1) "30mH,30Omega," (2) "60mH,30Omega],[" (3) "30mH,15Omega," (4) "90mH,45Omega]]

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