3. An RLC Circuit is governed by the differential equation d21 R dl +I-0 dt2 L dt LC where I(t) gives the current as a function of t, R is the resistance, L is the inductance, and C is the capacitance (R2 0, L > 0, C> 0). Without knowing about circuits, you can answer the following questions, because the structure is the same as for the linear pendulum model! (a.) Suppose here that R 0. Use the idea of the characteristic polynomial to find the general solution formula for I(t). What is the period of the resulting oscillations in current from part (a.)? (b.) Now consider the full differential equation: (c.) d21 R dl + dt2 +I-0 L dt LC Write this as a first order system of equations. Use the Jacobian matrix to find the characteristic equation. Confirm that this is the same characteristic equation as you would get directly from the second order differential equation.

3. An RLC Circuit is governed by the differential equation d21 R dl +I-0 dt2 L dt LC where I(t) gives the current as a function of t, R is the resistance, L is the inductance, and C is the capacitance (R2 0, L > 0, C> 0). Without knowing about circuits, you can answer the following questions, because the structure is the same as for the linear pendulum model! (a.) Suppose here that R 0. Use the idea of the characteristic polynomial to find the general solution formula for I(t). What is the period of the resulting oscillations in current from part (a.)? (b.) Now consider the full differential equation: (c.) d21 R dl + dt2 +I-0 L dt LC Write this as a first order system of equations. Use the Jacobian matrix to find the characteristic equation. Confirm that this is the same characteristic equation as you would get directly from the second order differential equation.