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JEE Main 2026 Physics question

PhysicsCurrent ElectricityJEE Main 2026

Two cells of emfs 1 V and 2 V and internal resistance 2 Ω and 1 Ω, respectively connected in parallel, gave a current of 1 A through an external resistance. If the polarity of one cell is reversed, then value of current through the external resistance will be α/5 A. The value of α is .

Answer: 3

Solution

For the parallel cells, =(1/2+2/1)/(1/2+1)=5/3 V and =1/(1/2+1)=2/3 Ω. With I=1 A,

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Question ID VK-015608