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Which of the following is correct when one cell is wrongly connected in series circuit?

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in Physics – Class 12 by (135k points)
Which of the following is correct when one cell is wrongly connected in series circuit?

(a) The total emf reduces by e

(b) The total emf increases by e

(c) The total emf increases by 2e

(d) The total emf decreases by 2e

I had been asked this question in an online interview.

Question is from Current Electricity topic in chapter Current Electricity of Physics – Class 12

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The correct answer is (c) The total emf increases by 2e

Explanation: When one cell is wrongly connected in series of n identical cells, each of emf e, it will reduce the total emf by 2e. So, effective emf is calculated as eEFF = ne – 2e. This happens in case of mixed grouping.

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