Answer:
Ammeter A with least count 0.25 A
(a) is correct option.
Step-by-step explanation:
Given that,
Four ammeters A, B, C and D having least counts.
least count of ammeter A = 0.25 A
least count of ammeter B = 0.5 A
least count of ammeter C = 0.05 A
least count of ammeter D = 0.1 A
We need to find the which ammeter
Using given data
When the resistance connectected in a parallel connection then the current flowing through the circuit is large.
So, we will need an ammeter which the least count is high for measuring current.
We use ammeter with higher least count value.
Hence, Ammeter A with least count 0.25 A
(a) is correct option.