For the below figure, find the effective potential difference when the batteries are connected in series.

20 v o l t s

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24 v o l t s

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26 v o l t s

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25 v o l t s

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Solution

The correct option is D $25 v o l t s$
In the circuit diagram, the cells are connected in series.
In a series connection of cells, the total potential difference will be the sum of potential differences of all the individual cells.
Effective potential difference $= V_{1} + V_{2} + V_{3} + V_{4} + V_{5}$
$(E f f e c t i v e p o t e n t i a l d i f f e r e n c e = 5 V + 7 V + 8 V + 4.2 V + 0.8 V = 25 V)$

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