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The mixed grouping of practical cells ar...

The mixed grouping of practical cells are shown in the figure. The given combination can be replaced by an efffective cell between A and B having emf E and internal resistance r, then choose the correct option

A

`E=4 V` , `r=2 Omega`

B

`E=4 V` , `r=1 Omega`

C

`E=8 V` , `r=2 Omega`

D

`E=8 V` , `r=1 Omega`

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