Question

Two identical cells whether joined in series or in parallel give the same current when connected to an external resistance of 1 ohm. Find internal resistance of each cell.​

Answer 1

Answer:

Let ε, r be the emf and internal resistance of each cell. External R=1Ω. Total resistance of the circuit =R+r/2=1+r/2.

Explanation:

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Answer 2

Answer:

hii, solution is :-

In series, current, i¹ = 1 E / 2 +2r

In parallel, current, i ² = E / 1+ r / 2 = 1E / 4+r

According to the question

Since, i¹ - i ²

1E/ 2+R = E / 1+1R

⇒r=1Ω.

Explanation:

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