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A series $\text{LCR}$ circuit consisting of $R=10 \Omega$, $\left|X_{L}\right|=20 \Omega$ and $\left|X_{C}\right|=20 \Omega$, is connected across an $a . c$. supply of $200 \mathrm{~V}$ rms. The rms voltage across the capacitor is

1. $200 \angle-90^{\circ} \mathrm{V}$
2. $200 \angle+90^{\circ} \mathrm{V}$
3. $400 \angle-90^{\circ} \mathrm{V}$
4. $400 \angle-90^{\circ} \mathrm{V}$