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In figure, the e.m.f. of the cell is 120V and internal resistance is negligible. The resistance of the voltmeter is 80 ohm. The % error in reading of voltmeter will be A. `20%`B. `16.7%`C. `21.2%`D. `12.8%` |
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Answer» Correct Answer - B Ideal voltmeter should measure (V) `=(120xx80)/(100)=96"Volt"` Voltmeter will measure (V) `=(120xx40)/(60)` = 80 volt `therefore%"error"=(96-80)/(96)xx100` `=(16)/(96)xx100=(50)/(3)=16.7%` |
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