The figure shows an experimental plot discharging of a capacitor in an `RC` circuit. The time constant of this circuit lies between:

Options

A. 150 s and 200 s
B. 0 s and 50 s
C. 50 s and 100 s
D. 100 s and 150 s

Answer

D

Explanation

As for potential across capacitor in discharging RC
circuit `V=V_(0)e^(-t//tau)`, when
`t=tau,V=V_(0)e^(-1)=(V_(0))/(e)`
`=(25)/(2.718)=9.2V`
Corresponding to `V=9.2V`, t lies between 10 s and 150 s.