A) The battery that runs the potentiometer should have voltage of 8 V
B) The battery of potentiometer can have a voltage of 15 V and R adjusted so that the potential drop across the wire slightly exceeds 10V
C) The first portion of 50 cm of wire itself should have potential drop of 10 V
D) Potentiometer is usually used for comparing resistances and not voltages
Correct Answer: B
Solution :
(b) The battery of potentiometer can have a voltage of 15 V and R adjusted so that the potential drop across the wire slightly exceeds 10V The balance point can be obtained only if the potential difference across the wire is greater than the emfs to be compared (or measured). Therefore, option (b) is correct.
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