Three moving iron type voltmeters are connected as shown below. Voltmeter readings are

$V$, $V1$ and $V2$ , as indicated. The correct relation among the voltmeter readings is

- $V=\frac{V1}{\sqrt{2}}+\frac{V2}{\sqrt{2}}$
- V =$V_1$ +$V_2$
- V =$V_1$$V_2$
- V =$V_2$ -$V_1$