$n$ identical cells are joined in series with its two cells $A$ and $B$ in the loop with reversed polarities. Emf of each shell is $E$ and internal resistance $r$. Potential difference across cell $A$ or $B$ is (here $n>4$)

 A milliammeter of range $10\mathrm{mA}$ and resistance $9\Omega$ is joined in a circuit as shown. The metre gives full-scale deflection for current $I$ when $A$ and $B$ are used as its terminals, i.e., current enters at $A$ and leaves at $B$ ($C$ is left isolated). The value of $\mathrm{I}$ is 

In the arrangement shown in the figure when the switch $S_2$ is open, the galvanometer shows no deflection for $l=\frac{L}{2}$. When the switch
$S_2$ is closed, the galvanometer shows no deflection for $l=\frac{5}{12}L$. The internal resistance $\left(\mathrm{r}\right)$ of $6 \mathrm{V}$ cell, and the emf $E$ of the other battery are respectively.

The variation of current $\left(I\right)$ and voltage $\left(V\right)$ is as shown in figure $A$. The variation of power $P$ with current $I$ is best shown by which of the following graph 

In the circuit diagram each resistor of resistance $5 \mathrm{\Omega }$. The points $A$ and $B$ are connected to the terminals of a cell of electromotive force $9 \mathrm{V}$ and internal resistance $\frac{2}{3} \mathrm{\Omega }$.

If the reading of ammeter is $2 \mathrm{A}$ then the reading of voltmeter

Write steady state current in the $2 \Omega$ resistor shown in the circuit (see figure). The internal resistance of the battery is negligible and the capacitance of the condenser $C$ is $0.2 \mathrm{mF}$ is terms of $N\times {10}^{-1}\mathrm{amp}$.