Question

The least count of the ammeter shown below is :



(1) 0.05 A
(2) 0.5 A
(3) 0.1 A
(4) 1 A

Answer 1

Least count of any scale is the value measured by a single division on it.

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

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

Hence the correct answer is option 1.