If and , the current in the circuit and potential difference between the points P and Q respectively are:
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Official Solution
Correct Option: (3)
Using Kirchhoff's Voltage Law (KVL) and Ohm’s Law: Thus, the correct answer is:
02
PYQ 2024
medium
physicsID: ap-eamce
Two identical cells gave the same current through an external resistance of regardless of whether the cells are grouped in series or parallel. The internal resistance of the cells is:
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Official Solution
Correct Option: (4)
To determine the internal resistance of the cells, let's analyze the scenario where the cells are connected in both series and parallel configurations.
Case 1: Cells in Series
The total electromotive force (emf) when cells are in series is and the total internal resistance is . The external resistance is .
The total resistance in the circuit is:
The current ( ) through the circuit is given by Ohm's Law:
Case 2: Cells in Parallel
When cells are in parallel, the total emf remains and the total internal resistance is . The external resistance is still .
The total resistance in the circuit is:
The current ( ) is:
Considering the problem statement:
The current in both series and parallel connections is the same:
