MHT CET 2024 Physics question
A cell balances against a length of 150 cm on a potentiometer wire when it is shunted by a resistance of 5. But when it is shunted by a resistance of 10, then balancing length increases by 25 cm. The balancing length when the cell is in an open circuit is
Answer: (B)
Solution
Let the cell have emf (proportional to the open-circuit balancing length ) and internal resistance . When shunted by , the terminal voltage is and the balancing length is . So . With , cm; with , $ =
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