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11. In Fig. 5 suppose e 120 v, R 200 Q, and L 10.0 H. Find the (a) final current after the swich has beern closed for a long time, (b) initial rate of change of current immediately after the switch has been closed, and (c) the time constant. [Ans : 0.6 A, l 2.0 A/s, 0.05 s]. [Hint: I e/R, ? L(AiA), or, (???t)initial-el -...] 12. Fig. 6 shows two coils mutually connected with a mutual inductance M. When a current in the primary changes by a rate ??/?? = 3.0 A/s, an EMF (6) of 7.0 mV is induced in the secondary coil. What is the value of M? ?? Fig. 5 Fig. 6
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