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A cell has an open circuit voltage V₁ and a close...

A cell has an open circuit voltage V₁ and a closed circuit voltage V₂ when a current is flowing through it. Therefore, the internal resistance of the cell is

A.

$\frac{V_2}{I}$

B.

$\frac{V_1}{I}$

C.

$\frac{(V_1 + V_2)}{I}$

D.

$\frac{(V_1 - V_2)}{I}$

E.

$\frac{(V_2 - V_1)}{I}$

View answer & explanation

Correct answer is E

On open circuit, V₁ = I; On closed circuit V₂ = IR + Ir

V₂ = V₁ + Ir

r = $\frac{(V_2 - V_1)}{I}$

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