A DC series motor takes the current of 15A and terminal voltage is 220 V. The armature and field resistance is 2 ohms and 0.2 ohm respectively. If the field resistance is shunted by resistance which...

A DC series motor takes the current of 15A and terminal voltage is 220 V. The armature and field resistance is 2 ohms and 0.2 ohm respectively. If the field resistance is shunted by resistance which is same as field resistance value and current taken by motor is 12 A then back emf induced is (estimated time 2 minutes)

a.
194.8V

b.
198.4 V

c.
217.6 V

d.
200.3 V