Wheatstone Bridge & Metre Bridge
Choose the correct circuit which can achieve the bridge balance.
Show answer and solution
Answer: (a)
- A bridge is balanced when no current flows through G, i.e. the ratio of arms is equal on both sides.
- A diode passes current only when forward biased; reverse biased it acts as an open arm.
- Check the diode direction in each circuit against the cell polarity and see which arm values then satisfy the ratio condition.
- So the answer is (a).