Two resistance of 100 Ω and 200 Ω are connected in series with a battery of 4 V and negligible internal resistance. A voltmeter is used to measure…

Two resistance of $\displaystyle 100 \Omega$ and $\displaystyle 200 \Omega$ are connected in series with a battery of $\displaystyle 4 V$ and negligible internal resistance . A voltmeter is used to measure voltage across $\displaystyle 100 \Omega$ resistance, which gives reading as $\displaystyle 1$ V . The resistance of voltmeter must be $\displaystyle \_\_\_\_ \Omega$.