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Assume that steady-state conditions exist in the given figure for t < 0. Also, assume $V_{S1} = 9$ V, $V_{S2} = 12$ V, $R_1 = 2.2$ ohm, $R_2 = 4.7$ ohm, $R_3 = 12$ kohm, and $L = 120$ mH.
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Find the Norton equivalent network seen by the inductor at t> 0.
The Norton equivalent circuit has $I_N =$ mA and $R_N = 12$ kohm.