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A potentiometer using cell C of emf 5V and internal resistance 0.2 ohms is connected to a wire AB in the figure below. A standard cell C0 of a constant emf of 1.10 V gives a balance point at 55 cm of the wire. When C0 is replaced by a cell of emf E, the balance point is obtained at 85 cm. What is the value of E?

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A potentiometer using cell C of emf 5V and internal resistance 0.2 ohms is connected to a wire AB in the figure below. A standard cell C<sub>0</sub> of a constant emf of 1.10 V gives a balance point at 55 cm of the wire. When C<sub>0</sub> is replaced by a cell of emf E, the balance point is obtained at 85 cm. What is the value of E?<br /><img src='https://www.fatskills.com/class12science/physics-questions-answers-current-electricity-potentiometer-q2.webp' width='245' height='129' />






 
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