A $10\mathrm{V}$ cell of negligible internal resistance is connected in parallel across a battery of emf 200 $\mathrm{V}$ and internal resistance $38\mathit{\Omega }$ as shown in the figure. Find the value of current in the circuit.
OR
In a potentiometer arrangement for determining the emf of a cell, the balance point of the cell in open circuit is $350\mathrm{cm}$. When a resistance of 9 $\mathit{\Omega }$ is used in the external circuit of the cell, the balance point shifts to $300\mathrm{cm}$. Determine the internal resistance of the cell.