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Physics-

General

Easy

Question

When the speed of a dc motor increases the armature current

Increases
Decreases
Does not change
Increases and decreases continuously

The correct answer is: Decreases

With the increasing speed, $omega$ increases. Thus current reduces due to increase in the back e.m.f.
Moreover $i equals fraction numerator V minus K omega over denominator R end fraction$ . More $omega$ will lead to the lesser current

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