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A motor having an armature of resistance $2 Ω$ is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210V. When the motor is running at full speed, the current in the armature is

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105A

110A

215A

answer is A.

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Detailed Solution

$i = \frac{E - e}{R} = \frac{220 - 210}{2} = \frac{10}{2} = 5 A$

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