What is the least value of an ammeter
is it 1. 0.1
2. 0.10
3. 0.2
4. 0.5

The least value varies depends on ammeter range. In the given question, ammeter range is not mentioned. So, the least value of an ammeter is 0.1 or 0.5 (depends on ammeter range).

Explanation:

The least value of an ammeter is the measure of the smallest number which can be observed in ammeter. So the least value will be varying depending upon its range. If we consider the range of ammeter is 30 A and the scale readings are 10 numbers, then the least value will be 30/10 = 3 A per scale.

So the least value is determined as

So among the given options 0.1 is most suitable for an ammeter with range of 3 A with 30 divisions.

if they have a finite resultant