Question

When a resistor of 11 Ω is connected in series with an electric cell, the current following in it is 0.5 A. Instead, when a resistor of 5Ω is connected to the same electric cell in series, the current increases by 0.4 A. The internal resistance of the cell is?

• A. 1.5 Ω
• B. 2 Ω
• C. 2.5 Ω
• D. 3.5 Ω

Hint:

The internal resistance of a cell can be determined by using Ohm’s law and analyzing how the current changes with different external resistances.

Answer 1

The Correct Option is C

By using Ohm's law, the internal resistance can be found by considering the changes in current when the resistance of the external resistor is altered. The internal resistance can be calculated by comparing the voltage drop across the resistor with the change in current.