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Grade: 11
        How many time constants will elapse before the charge on a capacitor falls to 0.1% of its maximum value in a discharging RC circuit?
4 years ago

Answers : (1)

Aditi Chauhan
askIITians Faculty
396 Points
							Sol. q = Qe^–t/RC
q = 0.1 % Q RC ⇒ Time constant
= 1 * 10^–3 Q
So, 1 * 10^–3 Q = Q * e^–t/RC
⇒ e^–t/RC = ln 10^–3
⇒ t/RC = –(–6.9) = 6.9

						
4 years ago
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