engineering recuitment GATE IN Test Series 2023-24 Mock Test Sensors and Industrial Instrumentation Resistive Transducers
The galvanometer used in a Wheatstone bridge as detector can detect a current as low as 0.1 nA and its resistance is negligible compared to internal resistance of the bridge. Each arm of the bridge has a resistance of 1 kΩ. The input voltage applied to the bridge is 20 V. The smallest change in the resistance that can be detected is
1
10 μΩ
2
20 μΩ
3
30 μΩ
4
40 μΩ