Reading of ammeter $A_1, A_2$ and $A_3$ will be respectively
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Reading of ammeter $A_{1}=\frac{10-4}{6}=1 \mathrm{\,A}$
Reading of ammeter $\mathrm{A}_{2}=1-0.5=0.5 \mathrm{\,A}$
Reading of ammeter $A_{3}=\frac{4-0}{8}=0.5 \mathrm{\,A}$
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