Consider the two differential equations: тx" + bx' + kx%3D F(t) dI + RI +1 = dt E(t) C where m, b, and k are constants for a spring-mass system and L, R, and C are constants for an electrical circuit consisting of an inductor, resistor, and capacitor in series. a) If we write the circuit equation in terms of q and its derivatives, we see that the circuit equation is analogous to forced motion of a spring. If the electromotive force E(t) is given by E(t) = E, cos(@t), find the steady-state solution for charge (so just a particular solution). Remember that if R>0, then your guess function could not possibly overlap with the complementary solution.

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Consider the two differential equations:
mx" + bx' + kx = F (t)
dI
L= E(t)
L
+ RI +
dt
C
where m, b, and k are constants for a spring-mass system and L, R, and C are constants for an electrical
circuit consisting of an inductor, resistor, and capacitor in series.
a)
we write the circuit equation in terms of g and its derivatives, we see that the circuit equation is
analogous to forced motion of a spring. If the electromotive force E(t) is given by
E(t) = E, cos(ot), find the steady-state solution for charge (so just a particular solution).
Remember that if R> 0, then your guess function could not possibly overlap with the
complementary solution.
Transcribed Image Text:Consider the two differential equations: mx" + bx' + kx = F (t) dI L= E(t) L + RI + dt C where m, b, and k are constants for a spring-mass system and L, R, and C are constants for an electrical circuit consisting of an inductor, resistor, and capacitor in series. a) we write the circuit equation in terms of g and its derivatives, we see that the circuit equation is analogous to forced motion of a spring. If the electromotive force E(t) is given by E(t) = E, cos(ot), find the steady-state solution for charge (so just a particular solution). Remember that if R> 0, then your guess function could not possibly overlap with the complementary solution.
b) Find the amplitude of your answer from (a).
c) Consider the values of L, R, and C to be constants of the circuit, but allow E(t) to be varied by
changing the period of the oscillations by changing o. What value of w maximizes the amplitude
from (b)? Give your answer in terms of L, R, and C.
d) Calculate the limit as R approaches 0 from the right of your answer to (c). The result is the natural
frequency of an LC circuit.
Transcribed Image Text:b) Find the amplitude of your answer from (a). c) Consider the values of L, R, and C to be constants of the circuit, but allow E(t) to be varied by changing the period of the oscillations by changing o. What value of w maximizes the amplitude from (b)? Give your answer in terms of L, R, and C. d) Calculate the limit as R approaches 0 from the right of your answer to (c). The result is the natural frequency of an LC circuit.
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