MCQOPTIONS
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MCQOPTIONS
| 1. |
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 |
| A. | 10 μΩ |
| B. | 20 μΩ |
| C. | 30 μΩ |
| D. | 40 μΩ |
| Answer» C. 30 μΩ | |