Question

Four students recorded the readings of the potential difference by observing the position of the pointer of an ideal voltmeter as shown below:



(1) 2.5 V
(2) 2.0 V
(3) 2.2 V
(4) 2.4 V

Answer 1

Total number of divisions on the scale = 15
The maximum value that can be measured = 3 V

Least count = $\frac{3\text{V}}{15}=0.2\text{V}$

As there is no zero error, so the correct reading of the scale = $11\times 0.2\text{V=}2.2\text{V}$

Hence, the correct answer is option 3.