The magnitude and direction of the current in the circuit shown will be:

The variation of terminal potential difference $\left(V\right)$ with current flowing through as cell is as shown

The $\mathrm{emf}$ and internal resistance of the cell are

In the given circuit find reading of ammeter (in A) when capacitor has attained steady state. (Approximate the answer to the nearest integer)

One of the circuits for the measurement of resistance by potentiometer is shown. The galvanometer is connected at point $A$ and zero deflection is observed at length $PJ=30 \mathrm{cm}.$ In second case the secondary cell is changed. Take $E_S=10 \mathrm{V}$ and $r=1\mathrm{\Omega }$ in $1^{\mathrm{st}}$ reading and $E_S=5 \mathrm{V}$ and $r=2\mathrm{\Omega }$ in $2^{\text{nd }}$ reading. In second case, the zero deflection is observed at length $PJ=10 \mathrm{cm}$. What is the resistance $R$ (in ohm)?

In the potentiometer circuit of the figure, when the key $K$ is inserted, balanced length is found to be $20 \mathrm{cm}$ for $R=10 \mathrm{\Omega }$ and $24 \mathrm{cm}$ for $R=20 \mathrm{\Omega }$. The balanced length if $\text{key}\mathit{ }K$ is taken out will be,