Question

For the following circuit:

1

At t=0 the voltage drop on the capacitor is $V_{c}=0$ and points s and 1 are connected.

1) Which of the following statement describe what will happen in the circuit ? (select one)

a. The capacitor will be charged to a final voltage of $E-IR$ , with I being the current in the circuit

b. The capacitor will disconnect the circuit so no current will exist

c. The voltage will oscillate at an angular frequency of $(LC)^{-1/2}$

d. The voltage will oscillate at an angular frequency of of $(RC)^{-1}$

e. The capacitor will be charged to a final voltage of E

2) After a long period, we connect s-2. What will happen to the circuit now?

a. There will be oscillations in the current (voltage) at a frequency of $(RC)^{-1}$

b. There is no voltage source in the circuit, so no current will exist.

c. The capacitor will discharge through the coil in an exponential manner, with a time constant of RC

d. There will be oscillations in the current (voltage) at a frequency of $(LC)^{-1/2}$

e. The capacitor will discharge through the coil in an exponential manner, with a time constant of $(LC)^{1/2}$

3) We choose the connection moment of s-2 to be t=0.

For the following values : $V=8.8 V, R=5.5\Omega , C=2.3\mu F, L=5.2mH$ . What is the closest time that the connection can be switched back to s-1, so that no current will flow in the upper circuit ?

Answer 1

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