ElectroMagnetic InductionMedium
Question
The time constant of an iductance coil is 2.0 × 10-3 s. When a 90 Ω resistance is joined in series, the time constant becomes 0.5 × 10-3 s. The inductance and resistance of the coil are :-
Options
A.30 mH ; 30 Ω
B.30 mH ; 60 Ω
C.60 mH ; 30 Ω
D.60 mH ; 60 Ω
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