Three ammeters − ,1 ,2 and 3 have different internal resistances r1 ,r2 and r3 respectively. Internal resistance r1 is known but r2 and r3 are unknown. The angular deflection of pointer in each ammeter is proportional to the current. Initially, the three ammeters were connected in series to a voltage source and deflections for the three ammeters were θ1 , θ2 and θ3 respectively. The three ammeters were then connected in parallel to the same voltage source. This time the deflections were observed to be θ′1 , θ′2 and θ′3 respectively. If θ2=θ3 but θ′3>θ′2 then

Three ammeters − ,1 ,2 and 3 have different internal resistances r

1.	Three ammeters − ,1 ,2 and 3 have different internal resistances r1 ,r2 and r3 respectively. Internal resistance r1 is known but r2 and r3 are unknown. The angular deflection of pointer in each ammeter is proportional to the current. Initially, the three ammeters were connected in series to a voltage source and deflections for the three ammeters were θ1 , θ2 and θ3 respectively. The three ammeters were then connected in parallel to the same voltage source. This time the deflections were observed to be θ′1 , θ′2 and θ′3 respectively. If θ2=θ3 but θ′3>θ′2 then
Answer» Three ammeters $-, 1, 2$ and $3$ have different internal resistances $r_{1}, r_{2}$ and $r_{3}$ respectively. Internal resistance $r_{1}$ is known but $r_{2}$ and $r_{3}$ are unknown. The angular deflection of pointer in each ammeter is proportional to the current. Initially, the three ammeters were connected in series to a voltage source and deflections for the three ammeters were $θ_{1}, θ_{2}$ and $θ_{3}$ respectively. The three ammeters were then connected in parallel to the same voltage source. This time the deflections were observed to be $θ_{1}^{'}, θ_{2}^{'}$ and $θ_{3}^{'}$ respectively. If $θ_{2} = θ_{3}$ but $θ_{3}^{'} > θ_{2}^{'}$ then

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