Electro Magnetic Induction And Alternating Currents Question 229
Question: When the speed of a dc motor increases the armature current [CPMT 1984, 85; MP PMT 2004]
Options:
A) Increases
B) Decreases
C) Does not change
D) Increases and decreases continuously
Show Answer
Answer:
Correct Answer: B
Solution:
With the increasing speed, w increases. Thus current reduces due to increase in the back e.m.f. Moreover $ i=\frac{V-K\omega }{R} $ . More w will lead to the lesser current.
