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

1. $V=\frac{V1}{\sqrt{2}}+\frac{V2}{\sqrt{2}}$
2. V =$V_1$ +$V_2$
3. V =$V_1$$V_2$
4. V =$V_2$ -$V_1$

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