In case two cells are identical, each of emf $E=5 \mathrm{V}$ and internal resistance $r=2 \Omega$, calculate the voltage across the external resistance $R=10 \Omega$

A $10 \mathrm{V}$ cell of negligible internal resistance is connected in parallel across a battery of emf $200 \mathrm{V}$ and internal resistance $38 \mathrm{\Omega }$ as shown in the figure. Find the value of current in the circuit. 

Using Kirchhoff$\text{'}$s rules, calculate the current through the $40 \mathrm{\Omega }$ and $20 \mathrm{\Omega }$ resistors in the following circuit$:$

What is end error in a metre bridge? How is it overcome? The resistances in the two arms of the metre bridge are $\mathrm{R}=5 \mathrm{\Omega }$ and $\mathrm{S}$ respectively. 

When the resistance $\mathrm{S}$ is shunted with an equal resistance, the new balance length found to be $1.5{\mathrm{l}}_1$, where ${\mathrm{l}}_1$ is the initial balancing length. Calculate the value of $\mathrm{S}$.