AB is a potentiometer wire of length 100 cm and its resistance is 10 ohms. It is connected in series with a resistance 
ohms and a battery of e.m.f. 
and negligible internal resistance. If a source of unknown e.m.f. 
is balanced by 40 cm length of the potentiometer wire, the value of 
is
A
0.8 
B
1.6 
C
0.08 
D
0.16 
Text Solution
Verified by ExpertsThe correct answer is:
D
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