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I could do everything except explaining why Part C's answer is correct

Part A

Calculate the time required to reach this state if C = 0.910 microF, R = 690 kilo ohms, and Q_0 = 6.80 microC.

t=19.7s

Part B

How many time constants is this?

31.4 time constants

Part C

For a given Q_0, is the time required to reach this state always the same number of time constants, independent of the values of C and R?

yes

Part D

Why or why not? (in response to Part C)

Part D is what i cant explain. Can anyone help?