Engineering Electromagnetics
Engineering Electromagnetics
9th Edition
ISBN: 9780078028151
Author: Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher: Mcgraw-hill Education,
Question
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Chapter 5, Problem 5.9P
To determine

(a)

The required diameter for a 2 m long nichrome wire.

To determine

(b)

The rms current density in the wire.

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A copper conductor has a diameter of 0.6 in and it is 1200 ft long. Assume that it carries a total dc current of 50 A. Find the total resistance of the conductor and the current density. The resistivity of copper is 1.72 x 10-8 2-m.
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Please choose the correct answer and explain if possible. Thank you. 4. The main terminal voltage across an ON conducting SCR depends on the instantaneous main terminal current in the following way: a. They are proportional b. The voltage increases as the current increases, but no quite proportionally c. The voltage increases as the current increases, by a squared (seond power) relationship d. They are virtually non-related 5. To turn Off a conducting SCR in a dc-powered circuit, it is necessary to: a. Interrupt (stop) the gate current b. Wait for the main terminal current to fall below IHO when the supply voltage crosses through zero c. Deliver a pulse of negative gate current via the gate lead d. Place a temporary reverse bias across the SCR’s main terminals 6. In a simple RC charging circuit used for trigger-control of an SCR, a good range of adjustment of the RC time-constant is: a. 1 to 5 msec b. 1 to 30 msec c. 0.1 to 10 msec d. 2 to 25 μsec

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Engineering Electromagnetics

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Publisher:Mcgraw-hill Education,