$A$ group of lamps having a total power rating of $1000 \,W$ is supplied by an $AC$ voltage of $E = 200 \sin(310t + 60^{\circ})$. The $r.m.s.$ value of the current flowing through the circuit is:
- A$10 \,A$
- B$5 \sqrt{2} \,A$
- C$20 \,A$
- D$10 \sqrt{2} \,A$
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