Question

The scale of an ammeter is shown below:



The least count of this ammeter is :
(1) 0.1 A
(2) 0.01 A
(3) 0.02 A
(4) 0.2 A

Answer 1

Least count of any scale is the value measured by a single division on it.
Total number of division on the given scale = 30
The maximum value that can be measured = 6 A

Least count = $\frac{6\text{A}}{30}=0.2\text{A}$

Hence the correct answer is option 4.