MHT CET 2023 Physics question
Two cells E<sub>1</sub> and E<sub>2</sub> having equal E.M.F. 'E' and internal resistance and () respectively are connected in series. This combination is connected to an external resistance 'R'. It is observed that the potential difference across the cell E<sub>1</sub> becomes zero. The value of 'R' will be
Answer: (A)
Solution
The cells are in series and aid each other, so the circuit current is . The terminal potential difference of E<sub>1</sub> is . Setting gives . Equating the two expressions: , so r_1$
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