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Question: Find the time constant of given circuit– ![](https://cdn.pureessence.tech/canvas_328.png?top_left_x...

Find the time constant of given circuit–

A

(a) 4ms

A

(b) 18ms

A

(c) 8ms

A

(d) 89μs\frac{8}{9}\mu s

Explanation

Solution

(d)

Ceq=2×42+4=86μ F\mathrm { C } _ { \mathrm { eq } } = \frac { 2 \times 4 } { 2 + 4 } = \frac { 8 } { 6 } \mu \mathrm {~F}Req = 2×12+1=23Ω\frac { 2 \times 1 } { 2 + 1 } = \frac { 2 } { 3 } \Omega

C = Req Ceq = 86×23=89\frac { 8 } { 6 } \times \frac { 2 } { 3 } = \frac { 8 } { 9 } msec