Question

A battery of 24 cells each of emf 1.5 V and internal resisatnce 2Ω is connected so as to send maximum current through a 125 resistance. In order to achieve this we must connect.

(1) 6 cells in series and connect 4 such rows in parallel

(2) all the 24 cells in series

(3) all the 24 cells in parallel

(4) 12 cells in series and connect 2 such rows in parallel

Answer 1

(4) 12 cells in series and connect 2 such rows in parallel

Let us connect cells in mixed grouping where n cells are connected in series in one row and m such rows are connected in parallel. Let N = Nr = 24 

Then for maximum current in external resistance.