10.12 QUESTIONS
1. What is the differential equation describing iL for t ≥ 0+ in the circuit in Fig. 10.12-1?
Fig. 10.12-1
2. A series RL circuit with non-zero initial energy is driven by a unit step voltage source. The circuit current is found to reach 75% of its steady-state value in one time constant. Express the initial current in the inductor as a percentage of its steady-state value.
3. A series RL circuit is driven by a unit step voltage source. iL is found to be 50% at t = τ. Was there any initial current in the inductor? If so, what is its magnitude and direction?
4. Find the ratio E/V such that iL in Fig. 10.12-2 becomes
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