The inductor L in the circuit shown in Figure P5.36 is the coil of a relay. When the current iL through the coil is equal to or greater than 2mA, the relay is activated. Assume steady-state conditions at t < 0.
If VS = 12V L = 10.9mH R1 = 3.1k?
Determine R2 so that the relay activates 2.3 after the switch is thrown.
Analysis:
First, determine R_1. The current through L when t>0 must be made such that:
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