Current Electricity and Electrical InstrumentMedium
Question
Choose the correct circuit which can achieve the bridge balance.
Options
A.
B.
C.
D.
Solution
Sol. [Key Concept: Wheatstone bridge balance condition]
In option (3),
$$\frac{10}{15} = \frac{10}{5 + R_{D}} $$The diode can conduct and have resistance $R_{D} = 10\Omega$ because diode have dynamic resistance. In that case bridge will be balanced.
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