AIIMS 2018 Physics Batteries in Parallel MCQ Question
Assertion : Two non-ideal batteries are connected in parallel. The equivalent emf is smaller than either of the two emfs.
Reason : The equivalent internal resistance is greater than either of the two internal resistances
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In a parallel configuration of batteries, the equivalent electromotive force (emf) is determined by the battery with the highest voltage, while the internal resistance is calculated using the formula , which is indeed less than either or . Option (A) incorrectly suggests a formula for emf that does not apply to parallel circuits, as it implies a dependency on both battery voltages and resistances in a way that is not valid. Option (B) correctly identifies the formula for internal resistance but does not address the emf, making it incomplete. Thus, option D is the only choice that accurately reflects the principles governing parallel battery configurations.
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