Test Preparation on Current Electricity-III-Physics Test Series IIT JEE-2020

1.

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 emf’s is

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