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9. (12) Given the LRC circuit with L henries, R-10 ohms, C- farads and E(t) = 50 cos t 30 volts, the charge q(t) satisfies the linear second order ordinary differential equation 2 dq1 dt2 (a) Find the charge q(t) if q(0) 100 coulombs and (0)0 amperes. (b) Identify in q(t) the transient terms and, respectively, the steady state terms. Is the circuit overdamped, underdamped, or critically damped? E(t) Figure 1: Problem9.

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