A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of 
‘s is
Text Solution
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Suppose two cells have emf’s 
and 
(also 
).
Potential difference per unit length of the potentiometer wire 
(say)
When 
and 
are in series and support each other then
(i)
When 
and 
are in opposite direction
(ii)
On adding eqn. (i) and eqn. (ii)
and 
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