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A moving coil voltmeter has a uniform scale with 100 divisions, the full scale reading is 200 V and 1/10 of a scale division can be estimated with a fair degree of certainty.The resolution of the instrument in volt is
  • a)
    2
  • b)
    0.01
  • c)
    0.2
  • d)
    1
Correct answer is option 'C'. Can you explain this answer?
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Resolution of the Instrument
The resolution of an instrument is the smallest change in the quantity being measured that can be detected by the instrument. In the case of a moving coil voltmeter, the resolution is determined by the smallest change that can be observed on its scale.

Given Data
- Number of divisions on the scale: 100
- Full-scale reading: 200 V
- Smallest change that can be estimated: 1/10 of a scale division

Calculation
To calculate the resolution of the instrument in volts, we need to determine the value of the smallest change on the scale in volts.
Each division on the scale represents a voltage of 200 V / 100 = 2 V.
Therefore, the smallest change that can be estimated on the scale is 2 V / 10 = 0.2 V.

Resolution
Therefore, the resolution of the instrument is 0.2 V, which means that the smallest change in voltage that can be detected by the moving coil voltmeter is 0.2 V. Hence, option 'C' (0.2) is the correct answer.
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