In a potentiometer, the emf of a cell is directly proportional to its balancing length:
$$E \propto l \implies \frac{E_1}{E_2} = \frac{l_1}{l_2}$$Given:
- $E_1 = 1.5\,\text{V}$, $l_1 = 45.0\,\text{cm}$
- $l_2 = 75.0\,\text{cm}$
Substituting the values:
$$E_2 = E_1 \times \frac{l_2}{l_1} = 1.5 \times \frac{75.0}{45.0} = 1.5 \times \frac{5}{3} = 2.5\,\text{V}$$विभवमापी के सिद्धांत के अनुसार, सेल का विद्युत वाहक बल संतुलन लंबाई के अनुक्रमानुपाती होता है:
$$E \propto l \implies \frac{E_1}{E_2} = \frac{l_1}{l_2}$$दिए गए मान:
- $E_1 = 1.5\,\text{V}$, $l_1 = 45.0\,\text{cm}$
- $l_2 = 75.0\,\text{cm}$
मान रखने पर:
$$E_2 = E_1 \times \frac{l_2}{l_1} = 1.5 \times \frac{75.0}{45.0} = 1.5 \times \frac{5}{3} = 2.5\,\text{V}$$