First slide

Magnetic flux and induced emf

Question

When the speed of a dc motor increases the armature current

Easy

A

Increases
B

Decreases
C

Does not change
D

Increases and decreases continuously

Solution

With the increasing speed, $ω$ increases. Thus current reduces due to increase in the back e.m.f.
Moreover $i = \frac{V - Kω}{R}$ . More $ω$ will lead to the lesser current.

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