Two ammeters, 1 and 2, have different internal resistances: 
(known) and 
(unknown). Each ammeter has scale such that the angular deviation of the needle from zero is proportional to the current passing through it. Initially, the ammeters are connected in series to a source of constant voltage. The deviations of the needles of the ammeters are 
and 
, respectively. The ammeters are then connected in parallel to the same voltage source. This time, the deviations of the needles are 
and 
respectively. Find 
in terms of 
and 
.
,
Text Solution
Verified by ExpertsB
In first case
…(1)
In second case,
…(2)
from (1) and (2), we get 
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