Question

The internal resistance of a cell of emf 4V is 0.1 Ω. It is connected to a resistance of 3.9 Ω. The voltage across the cell will be –

• A. 3.9 V
• B. 2 V
• C. 0.1 V
• D. 3.8 V

Answer 1

Voltage across cell = E – i r = E – $\left( \frac{E}{r + R} \right)$r

= $\left( \frac{E}{r + R} \right)$R