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  4. Calculate the time constant (in second) of the circuit.

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Q. Calculate the time constant (in second) of the circuit.Physics Question Image

Current Electricity

Solution:

$\tau=R_{ Th } \cdot C ; R_{ Th }$ is the thevenin resistance at the capacitor terminals.
$R_{ Th }=8+[20 \| 9+(70 \| 30)]=20 \,k \,\Omega$
$\tau=0.12\, s$