Current Electricity and Electrical InstrumentHard
Question
AB is a potentiometer wire of length 100 cm and its resistance is 10 ohm. It is connected in series with a resistance R = 40 ohm and a battery of e.m.f. 2V and negligible internal resistance. If a source of unknown e.m.f. E is balanced by 40 cm length of the potentiometer wire, the value of E is:
Options
A.0.8 V
B.1.6 V
C.0.08 V
D.0.16 V
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