A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 39. A high-resistance voltmeter connected across the cell registers only 0.9V. Calculate the internal resistance of the cell

• A 1.85Ω
• B 2.0Ω
• C 2.4Ω
• D 4.5Ω
• E 5.0Ω