1.

In the given circuit Fig the switch is closed at t = 0. Choose the correct answers.

Answer»

CURRENT in the inductor when the circuit reaches the steady state is `4 A`.
The net CHANGE in flux in the inductor is `1.5 Wb`.
The time constant of the circuit after closing `S` is `555.55 s`
The charge stored in the capacitor in steady state is `1.2 mC`.

SOLUTION :At `t lt 0, I_(L) = (6)/(6) = 1A`
At `t gt gt 0, I_(L) = (12)/(3) = 4 A`
`:. | PHI| = L [i_(f) - i_(i)] = 500 xx 10^(-3) xx 3= 1.5 Wb
`:.` (a) and (b) are the corrent choices.


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