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A circuit containing a two position swit...

A circuit containing a two position switch S is shown in fig.

(a) The switch S is in position '1'. Find the potential difference `V_(A)-V_(B)` and the rate of production of joule heat in `(R_1)`.
(b) If now the switch S is put in position 2 at t=0 find
(i) steady current in `(R_4)` and
(ii) the time when current in `(R_4)` is half the steady value.
Also calculate the energy stroed in the inductor L at that time.

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