Engineering Electromagnetics
Engineering Electromagnetics
9th Edition
ISBN: 9780078028151
Author: Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher: Mcgraw-hill Education,
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Chapter 1, Problem 1.27P
To determine

(a)

The surface on which the field is perpendicular to the x - y plane. Also, express the field on that surface in cylindrical coordinates.

To determine

(b)

The coordinate axis on which the field is entirely perpendicular to the x - y plane and express the field there in cylindrical coordinates.

To determine

(c)

The surface on which the field is entirely parallel to the x - y plane.

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Q1. a) A lift is driven by a 230 V series DC motor. The motor resistance is 0.5 Q and the magnetic circuit is assumed unsaturated. The motor runs at 250 rev/min with a load current of 20 A. (i) If more passengers come into the lift and the load torque is increased by 21%, what would be the motor speed if the supply voltage is unchanged? (ii) In order to maintain the motor at 250 rev/min, what is the supply voltage required?
b) Consider a buck converter driven at a switching frequency of 50 kHz, supply voltage is 200V DC, and duty cycle is 0.25; i) Sketch labelled waveforms for: 1- Inductor current Transistor current 2- 3- Diode current 4- Diode voltage 5- Transistor voltage. ii) What is the value of the output voltage? iii) What are the peak voltages appearing across the transistor and diode?
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Publisher:Mcgraw-hill Education,