Physics - Current Electricity Question with Solution | TestHub

First, a set of $n$ equal resistors of $10\Omega$ each are connected in series to a battery of E.M.F. $20\mathrm{V}$ and internal resistance $10\Omega .$ A current $I$ is observed to flow. Then, the $n$ resistors are connected in parallel to the same battery. It is observed that the current is increased $20$ times, then the value of $n$ is ___________.