A series motor of resistance 1 Ω between the terminals runs at 800 r. p. m. at 200 V with a current of 15 A . Find the speed at which it will run when connected in series with a 5 Ω resistance and taking the same current at the same supply voltage.
1
476 r.p.m.
2
384 r.p.m.
3
572 r.p.m.
4
602 r.p.m.