1.

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%`

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%`


Discussion

No Comment Found

Related InterviewSolutions