In the circuit shown below, the diode has 20 in forward bias resistance. When V_i increases from 8 V to 12 V, then change in the current is found to be x ~mA . Find the value of x .

Step-by-step solution

Diode will be in forward bias when V_i is greater than 10 V and it conducts till V_i is 12 V . Total circuit resistance =200+20=220 When V_i is less than 10 V , the diode will not conduct due to its reverse biasing. Thus, initial current, i₁=0 . When V_i=12 ~V , then diode will be in forward bias with effective voltage, V^ =12-10=2 ~V Maximum current, I₂= V^ R = 2 220 =0.009 ~A =9 ~mA Change in current, I=I₂-I₁=9 ~mA