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

20 volts

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24 volts

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26 volts

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25 volts

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Solution

The correct option is D
25 volts

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 $= V_{1} + V_{2} + V_{3} + V_{4} + V_{5}$
Effective potential difference = 5V +7V +8V +4.2V +0.8V = 25V.

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