Discussion
A voltmeter specified as \( \pm 0.5\% \) of reading \( \pm 2 \) counts reads 100.0 V on a three and a half digit display. The possible error is
Answer: C
On the 200 V range one count is 0.1 V, so two counts is 0.2 V, and half of one per cent of the reading is 0.5 V. The two add to 0.7 V, that is 0.7 per cent of the reading, and the count term would dominate entirely at a much smaller reading.
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