Twelve cells each having  the same e.m.f are  connected  in series and are kept to a closed box.
Channel: Doubtnut
Date: 30/08/2020

Twelve cells each having  the same e.m.f are  connected  in series and are kept to a closed box.  Some of the cell are connected in reverse  order .The battery  is connected  in series with an ammeter an external resistance `R` and two cells of the same type as an in the battery .The current when they and such  each other is `3` ampere and current is `2` ampare when the two oppose each other. How many cells are connected in servese order ?