AIPMT PRELIMS2002Physics-Current Electricity
AIPMT PRELIMS 2002 Physics Electromotive Force and Internal Resistance MCQ Question
Type: MCQ-numerical-Medium-Class 12
For a cell terminal P.D. is 2.2V when circuit is open and reduces to 1.8V when cell is connected to a resistance of R = 5Ω. Determine internal resistance of cell (r) is then :-
A
10/9 Ω
B
9/10 Ω
C
11/9 Ω
D
9/5 Ω
Correct Answer
Option A
Detailed Explanation
Using the formula V = E - Ir, where E is the emf, V is the terminal voltage, I is the current, and r is the internal resistance. Solving gives r = 10/9 Ω.
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