A voltage source VAB = 4 sin wt 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

A voltage source VAB = 4 sin wt 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 Correct Answer 10 k

During the positive half cycle,

D1 is forward bias

D2 is reverse bias

Now the circuit will become,

[ alt="F1 Neha.B 03-05-21 Savita D1" src="//storage.googleapis.com/tb-img/production/21/05/F1_Neha.B_03-05-21_Savita_D1.png" style="width: 267px; height: 118px;">

Impedance = 10 kΩ

During the negative half cycle

D1 is reverse bias

D2 is forward bias

Now the circuit will become,

[ alt="F1 Neha.B 03-05-21 Savita D2" src="//storage.googleapis.com/tb-img/production/21/05/F1_Neha.B_03-05-21_Savita_D2.png" style="width: 268px; height: 120px;">