Two resistors of 200 Ω and 400 Ω are connected in series with a battery of 100 V. A bulb rated at 200 V, 100 W is connected across the 400 Ω…

Two resistors of $\displaystyle 200 \Omega$ and $\displaystyle 400 \Omega$ are connected in series with a battery of $\displaystyle 100$ V . A bulb rated at $\displaystyle 200 \mathrm{~V}, 100 \mathrm{~W}$ is connected across the $\displaystyle 400 \Omega$ resistance. The potential drop across the bulb is $\displaystyle \_\_\_\_$ V.