Question

An ammeter has 20 divisions between 20ma and 30ma. The least count of the ammeter is:
a) 0.5mA b)0.25mA c)1mA d)0.05mA

Answer 1

A) 0.5mA
Since Between 20mA and 30mA there are 10 Numbers and 20 divisions

Answer 2

an ammeter has 20 divisions
so the least count =(30-20)÷20
LC=10/20=1/2=0.5 ma. ans.
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