STANDARD Physics Ohm's Law MCQ Question
A battery of emf 15 V and internal resistance of 4 Ω is connected to a resistor. If the current in the circuit is 2 A, the resistance of the resistor is
3 Ω
4 Ω
5 Ω
6 Ω
Correct Answer
Detailed Explanation
Using Ohm's law, V = IR, where V is the emf minus the voltage drop across the internal resistance. Therefore, 15 V = 2 A × (R + 4 Ω). Solving for R gives R = 5 Ω.
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