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Solution


Q.

In the following circuit, the reading of the ammeter will be (Take Zener breakdown voltage = 4V)              [2025]
1 24 mA  
2 80 mA  
3 10 mA  
4 60 mA  

Ans.

(3)

V1=400100+400×12V=45×12=485V

Here, V1>V2

So, Zener breakdown will be taking place.

Hence, voltage across 400 Ω will be 4V

I=4400A=1100A=10 mA