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Question: A cell of emf e and internal resistance r is put across a variable resistor of zero to 'R'. The VI c...

A cell of emf e and internal resistance r is put across a variable resistor of zero to 'R'. The VI curve indicates that –

A

Internal resistance is zero

B

Internal resistance is VI\frac{V}{I}

C

Internal resistance is e–VI\frac{e–V}{I}

D

None

Answer

Internal resistance is e–VI\frac{e–V}{I}

Explanation

Solution

V = e – ir ⇒ r = e–Vi\frac{e–V}{i}