Cells in Series and in Parallel

To draw a maximum current from a combination of cells, how should the cells be grouped?

$6$ electric cells are connected in series in an electronic device which works at $9$ V potential difference. Emf of on cell is 

To get maximum current through a resistance of $2.5 \mathrm{\Omega }$, one can use $m$ rows of cells, each row having $n$ cells. The internal resistance of each cell is $0.5 \mathrm{\Omega }$. What are the values of $n\mathit{ }\mathit{\text{and }}m\mathit{\text{,}}$ if the total number of cells is $45$?

A student connects four cells, each of emf $1.5 \mathrm{V}$ and internal resistance$0.25 \mathrm{\Omega }$ in series but one cell has its terminals reversed. This battery sends current in a $2 \mathrm{\Omega }$ resistor. The current is :

To get maximum current through a resistance of $2.5\mathrm{\Omega }$, one can use $m$ rows of cells, each row having $n$ cells. The internal resistance of each cell is $0.5\mathrm{\Omega }$. What are the values of $n \& m$, if the total number of cells is $45$?

Two cells with the same emf $\epsilon$ and internal resistance $r_{1 }\& r_2$ are connected in series to an external resistance $R\mathit{.}$ The value of $R$ so that the potential difference across the first cell be zero is:

In the network given below, find the charge on the capacitor (in $\mu \mathrm{C}$) at the steady state.}

In the circuit shown in figure, reading of ammeter will: 

Assertion: When cells are connected in series to the external load the effective e.m.f. increases.

Reason: The cells help each other in sending the current to the external load.

Two cells, having the same emf are connected in series through an external resistance $R$ . Cells have internal resistances $r_1$ and $r_2\mathrm{ }\left(r_1>r_2\right)$ respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of $R$ is -

Which of the following are true, when the cells are connected in series?