Question

Find the time constant `(in ) fo the given RC circuits in the given order respectively
,

`(R_1)=1 Omega, (R_2)=2 Omega, C_(1)=4 muF, C_(2)=2 mu F`
A. `18,4,8/9`
B. `18,8/9,4`
C. `4,18,8/9`
D. `4,8/9,18

Answer 1

Correct Answer - B
Time constant of R-C circuit is `(tau)=(R_(eq))(C_(eq))`
(i) `(tau_1)=(2+1)(2+4)=18(mu)s`
(ii) `(tau_2)=((2xx1)/(2+1))((2xx4)/(2+4))=8/9 (mu s)`
(iii)`(tau_3)=((2xx1)/(2+1))xx(4+2)=4(mu s)`.