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Solution


Q.

Choose the correct circuit which can achieve the bridge balance.                  [2024]
1  
2  
3  
4  

Ans.

(1)

For the bridge to be balanced, the arm containing diode should have 15 Ω resistance and diode in forward bias. In option (2) and (4), diode is in reverse bias and in option (3) diode is in parallel with a 5 Ω resistance, so effective resistance of this arm is less than 5 Ω. So the correct option is (1) as diode is in series with 5 Ω resistance which can give an equivalent resistance of 15 Ω in case if the diode is considered not ideal.