Discussion
For a measurement, indicated value is 225 V while true value is 226 V. What will be the static error of instrument ?
Answer: B
The static error is –1 V, option (B).
Static error is the indicated (measured) value minus the true value:
\[ e = 225 - 226 = -1\ \text{V} \]
The negative sign says the instrument reads low. The opposite number, +1 V (option A), is the static correction, the amount that must be added to the reading to get the true value. The values of 0.5 V and –0.5 V do not follow from the given readings.
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