(I need help with part C-E, I have already done part A & B) And some help on the
ID: 1536917 • Letter: #
Question
(I need help with part C-E, I have already done part A & B) And some help on the exercise portion. Please write LEGIBLY
(a) the time constant of the circuit
4.785 s
(b) the maximum charge on the capacitor
71.5 µC
(c) the charge on the capacitor after 6.10 s
_____µC
(d) the potential difference across the resistor after 6.10 s
________V
(e) the current in the resistor at that time
_______A
EXERCISE HINTS: GETTING STARTED | I'M STUCK!
Use the values from PRACTICE IT to help you work this exercise.
(a) Find the charge on the capacitor after 1.90 s have elapsed.
Q =_____ C
(b) Find the magnitude of the potential difference across the capacitor after 1.90 s.
VC = _______V
(c) Find the magnitude of the potential difference across the resistor at that same time.
VR =________ V
Explanation / Answer
c)
charge on the capacitor at any time is given as
Q = Qmax (1 - e-t/T)
Q = (71.5 x 10-6) (1 - e-6.10/4.785)
Q = 0.0000514 C = 51.4 uC
d)
Vc = potential difference across the capacitor after t = 4.785 sec , = Q/C = 51.4/5.5 = 9.4 volts
Vr = resistance across the resistor = E - Vc = 13 - 9.4 = 3.6 volts
e)
current in the resistor is given as
i = Vr/R = 3.6/(8.7 x 105) = 4.13 x 10-6 A
a)
charge on the capacitor at any time is given as
Q = Qmax (1 - e-t/T)
Q = (71.5 x 10-6) (1 - e-1.9/4.785)
Q = 23.4 uC
b)
Vc = potential difference across the capacitor after t = 1.9 sec , = Q/C = 23.4/5.5 = 4.25 volts
c)
Vr = resistance across the resistor = E - Vc = 13 - 4.25 = 8.75 volts
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