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 10 V
C) The first portion of 50 cm of wire itself should have a potential drop of 10 V.
D) Potentiometer is usually used for comparing resistances and not voltages.
Correct Answer: B
Solution :
| Option [b] is correct. |
| Explanation: Given that, emf of primary cells are 5 V and 10 V |
| The potential drop across potentiometer wire must be slightly more than that larger emf 10 V. So, the battery should be of 15 V and about 4 V potential is dropped by using rheostat or resistances. So option is correct. |
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