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In the circuit shown in the figure, one ...

In the circuit shown in the figure, one of the three switches is kept closed and other two are open. The value of resistance is R = 20 `Omega`. When the angular frequency(w) of the 100 V source is adjusted to 500 rad/s, 1000 rad/s and 2000 rad/s it was found that the current I was 4A, 5A and 4A respectively.
(a) Which switch id closed ?`(S_(1),S_(2) "or" S_(3))`
(b)Find the value of L and C.

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