Question

Four students measured the reading by observing the position of pointer on the ammeter scale as shown below:



Assuming that the ammeter has no zero error, the correct reading is :
(1) 1.25 A
(2) 1.30 A
(3) 1.15 A
(4) 1.1 A

Answer 1

Total number of divisions on the scale = 30
The maximum value that can be measured = 1.5 A

Least count = $\frac{1.5\text{A}}{30}=0.05\text{A}$

Ad there is no zero error, so the Correct reading of the scale = $23\times 0.05\text{A=}1.15\text{A}$

Hence the correct option is Option 3.