Question

there are n rows having m cells in each row the emf and internal resistance of the cell are 5 volt and 2ohm if the combination has net emf 20 volt and internal resistance equal to 1 ohm then no cells are 8*x then the value of x​

Answer 1

Current is maximum when equivalent resistance is equal to external resistance of 3 ohm.

Now total resistance is

n

m×0.5

. (Resistances are parallel so they are directly added to each other)

According to question:

n

m×0.5

=3

⇒

n

m

=6

As ratio of m and n is 6,then best option which satisfy this relation is option C