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JEE Physics · Medium

Current Electricity: Cells in Series MCQ

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Cells in SeriesMediumQuestion 31626

Question

Three identical cells (EMF E, internal resistance r each) in series supply current to external resistance R. Current is:
  1. A
    E/(R+r)
  2. B
    3E/(R+3r)
    Correct
  3. C
    E/(R+3r)
  4. D
    3E/(3R+r)

Correct answer

3E/(R+3r)

Explanation

Series cells: total EMF = 3E, total internal resistance = 3r. I = 3E/(R+3r).

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