An electric cable of aluminum (k = 240 W/ m degree) is to be insulated with rubb

Question

An electric cable of aluminum (k = 240 W/ m degree) is to be insulated with rubber (k = 6 W/ square meter degree). If the cable is in air (h = 6 W/square meter degree). Find the critical radius?

Options:

A . 80 mm

B . 160 mm

C . 40 mm

D . 25 mm

Answer: Option D
Answer: (d).25 mm

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