AIPMT PRELIMS2011Physics-Current Electricity
AIPMT PRELIMS 2011 Physics Internal Resistance MCQ Question
Type: MCQ-numerical-Medium-Class 12
A current of 2 Å flows through a 2 Ω resistor when connected across a battery. The same battery supplies a current of 0.5 Å when connected across a 9 Ω resistor. The internal resistance of the battery is
A
1 Ω
B
0.5 Ω
C
1/3 Ω
D
1/4 Ω
Correct Answer
Option C
Detailed Explanation
Using the formula V = I(R + r), solve for r: 2 = ε/(²⁺ r) and 0.5 = ε/(⁹⁺ r), leading to r = 1/3 Ω.
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