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Question: 

The back emf in a motor is 72 V when operating at 1800 rpm. What would be the back emf at 2300 rpm if the magnetic field is unchanged?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$92 \textrm{ V}$

Giancoli 7th Edition, Chapter 21, Problem 25

(1:38)

Chapter 21, Problem 25 is solved.

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