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The time constant of the network shown in the fig. is—

1. 4RC
2. 3RC
3. 2RC
4. 2RC
  3

Correct Option: A

Time constant τ = R _eq C
R _eq = 4R | | 4R = 2R
C = 2C
so, τ = 2 R. 2C
= 4RC