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Question

A student connects four 1/4 ohm cells in series but one cell has its terminals reversed. If each cell has an emf of 1.5 V and the external resistance is 2 ohm , then the current flowing is

A
1A
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B
1.5 A
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C
2.5 A
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D
zero
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Solution

The correct option is A 1A
Equivalent emf in series combination is given by,
Eeq=E1+E2+....
In the given question it will be,
Eeq=1.5+1.51.5+1.5
Req=14+14+14+14+2 ohm
Now, I=EeqReq
I=1A

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