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.



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