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Question

Two non-ideal batteries are connected in parallel. The equivalent EMF is smaller than either of the two EMFs?

A
True
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B
False
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Solution

The correct option is B False
Alright. Let’s try and find a scenario where the statement is violated.
Let’s take 2 cells of emf 1V and 2V, each having 1Ω internal resistance. Let’s find what the equivalent EMF is.
E=E1R1+E2R2R1+R2E=2+12E=1.5V
Since E=1.5V is greater than one of the cell EMF’s, the given statement is false.
Always for such questions, remember that trial and error can help you prove it to be false.

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