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5- A 1 mm diameter electric wire is covered with 2 mm thick layer of insulation (k 0.5 W/mK). Air surrounding the wire is at 25°C and h 25 W/m2.K. The wire temperature is 100°C. Find for Im length: (i) The rate of heat dissipation from the wire per unit length with and without insulation. (ii) The critical radius of insulation. (iii)The maximum possible value of heat dissipation. Answer: (10.90 W/m, 2.36 W/m, 50 mm, 42.07 W/m)

5- A 1 mm diameter electric wire is covered with 2 mm thick layer of insulation (k 0.5 W/mK). Air surrounding the wire is at 25°C and h 25 W/m2.K. The wire temperature is 100°C. Find for Im length: (i) The rate of heat dissipation from the wire per unit length with and without insulation. (ii) The critical radius of insulation. (iii)The maximum possible value of heat dissipation. Answer: (10.90 W/m, 2.36 W/m, 50 mm, 42.07 W/m)

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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5- A 1 mm diameter electric wire is covered with 2 mm thick layer of insulation (k = 0.5 W/mK). Air surrounding the wire is at 25°C and h = 25 W/m2.K. The wire temperature is 100°C. Find for 1m length: (i) The rate of heat dissipation from the wire per unit length with and without insulation. (ii) The critical radius of insulation. (iii)The maximum possible value of heat dissipation. Answer: (10.90 W/m, 2.36 W/m, 50 mm, 42.07 W/m)
Transcribed Image Text:5- A 1 mm diameter electric wire is covered with 2 mm thick layer of insulation (k = 0.5 W/mK). Air surrounding the wire is at 25°C and h = 25 W/m2.K. The wire temperature is 100°C. Find for 1m length: (i) The rate of heat dissipation from the wire per unit length with and without insulation. (ii) The critical radius of insulation. (iii)The maximum possible value of heat dissipation. Answer: (10.90 W/m, 2.36 W/m, 50 mm, 42.07 W/m)
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