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NEET 2006 Physics question

PhysicsCurrent ElectricityNEET 2006

Two cells, having the same e.m.f., are connected in series through an external resistance R. Cell have internal resistances and () respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:-

Answer: (1)

Solution

Let each cell have e.m.f. . In series, the current is . Potential difference across cell 1: . Equating:

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Question ID VK-089540