NEET Questions Solved

PMT - 2002

Two identical cells send the same current in 2 Ω resistance, whether connected in series or in parallel. The internal resistance of the cell should be 

(1) 1 Ω

(2) 2 Ω

(3) 12Ω

(4) 2.5 Ω

(2) In series , i1=2E2+2r

In parallel, I2=E2+r2=2E4+r

Since i1=i22E4+r=2E2+2rr=2Ω  

Difficulty Level:

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