A voltage source VAB = 4 sinωt is applied to the terminals

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A voltage source V_AB = 4 sinωt is applied to the terminals A and B of the circuit shown in the given figure. The diodes are assumed to be ideal. The impedance by the circuit across the terminals A and B is _________ kΩ .

1. 10
2. 20
3. 45
4. 66

Correct Option: A

Diode D₁ conducts through 10 kΩ on the extreme right and diode D₂ is blocked. Diode D₂ conducts through 10 kΩ in the middle branch and diode D₁ is blocked. Thus source always sees a resistance of 10 kΩ.