A potentiometer wire of length 10 cm and resistance 32 Ω Ω is connected in series with a battery of EMF 2.5 V, internal resistance 3 Ω Ω and external resistance R. If a secondary cell of 0. 4 V is balanced at 8 cm length. Then value of R is
Text Solution
Verified by ExpertsThe correct answer is:
D
Balancing length for cell of emf 
is 8 cm.
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