Question

Choose the correct circuit which can achieve the bridge balance.

Options

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Answer 1

Explanation:

In the 1^st option, the diode is forward-biased. So, no current flows through the 5-ohm resistor connected in parallel. In the 2^nd option, the diode is reversed-biased. No current flows through the diode arm. In the 4^th option, the diode is reverse-biased. No current flows through the diode arm. In the 3^rd option, the diode is forward-biased. So, current flows through a 5-ohm resistor connected in series. The bridge can be balanced.