physics test review question #2 help!~ 2. A 200 ko resistor and a capacitor are
ID: 1305683 • Letter: P
Question
physics test review question #2 help!~
2. A 200 ko resistor and a capacitor are connected in series with a battery. The time constant of this circuit is 0.8 seconds [aj What is the capacitance of the capacitor? [b] The battery is removed from the circuit when the capacitor has ben charged to 8X 10 C. Ifthe capacitor is then discharged through the resistor at t-0, what will be the charge on the capacitor att 0.8 seconds? [c The current through an inductor connectedin series with a 4uF capacitor oscillates with an angular frequency 25 rad/s. What is the inductance of the inductor?Explanation / Answer
a)
Time Constant
T=R*C
=>C=T/R =0.8/(200*103)
C=4*10-6s or 4.6 us
b)
For capacitor Discharge as a function of TIme
Q=Qmaxe-(t/T)
Q=(8*10-4)*e-(0.8/0.8)
Q=2.94*10-4C
c)
W=1/sqrt(LC)
L=1/W2C =1/252*(4*10-6)
L=400 H
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