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Consider the following statements The equivalent emf is equal to the individual emf of the cells in the series combination of cells having the same emf.  The equivalent emf is equal to the individual emf of the cells in the parallel combination of cells having the same emf. Which of the following statement is correct?

Consider the following statements The equivalent emf is equal to the individual emf of the cells in the series combination of cells having the same emf.  The equivalent emf is equal to the individual emf of the cells in the parallel combination of cells having the same emf. Which of the following statement is correct? Correct Answer Only 2

CONCEPT:

  • Grouping of Cells: In a series grouping of cell’s their emf’s are additive or subtractive while their internal resistances are always additive.
  • If dissimilar plates of cells are connected together then their emf’s are added to each other while if their similar plates are connected together then their emf’s are subtractive

 

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EXPLANATION:

  • Series grouping: In series grouping anode of one cell is connected to the cathode of other cells and so on.

 

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  • If n identical cells are connected in series
  1. Equivalent emf of the combination Eeq = nE
  2. Equivalent internal resistance req = nr
  • Parallel grouping: In parallel grouping, all anodes are connected at one point and all cathode are connected together at other points.

 

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  • If n identical cells are connected in parallel
  1. Equivalent emf of the combination Eeq = E
  2. Equivalent internal resistance req = r/n
  • Therefore, from above it is clear that the equivalent emf is the same in the parallel combination of cells. Therefore statement 2 is correct.

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