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Mixed Combination of Cells

Eight cells m...

Question

Eight cells marked 1 to 8 each of emf 5 V and internal resistance 0.2 ohm are connected as shown in figure. What is the reading of the ideal voltmeter V?

A

40 V

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B

20 V

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C

5 V

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D

\N

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Solution

The correct option is D \N

The emfs of cells connected in reverse polarity cancel each other. Hence cells marked 2, 3 and 4 together cancel the effect of cells marked 5, 6 and 7 and the circuit reduces to that shown in figure. Now cells 1 and 8 are in reverse polarity. Hence the voltmeter reading = 5 – 5 = 0 V

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