In the following circuit, the reading of the ammeter will be (Take Zener breakdown voltage =4 ~V )

Step-by-step solution

V ₁= 400 100+400 12 ~V = 4 5 12= 48 5 ~V here, V ₁ V _ z , ( V _ z = . Zener Voltage ) So, Zener breakdown will be take place So, voltage across 400 will be 4 V I = 4 400 ~A = 1 100 ~A =10 ~mA