The passage of electrical current through conductors generates heat, which must be dissipated to prevent damage heat is generated according to the expression q"" ircond where l is the electrical current density (a. m-2) and rcond is the internal resistance (ω.m). a copper wire of diameter r 2 mm carries current density of 1000 a. cm-2 and electrical resistance of rcond 2 x106 q. cm. the copper is insulated with a material which has a thermal conductivity of 103 w. cm1.k-1 and the outside of the wire is exposed to moving air with a convective heat transfer coefficient of 0.002 w. cm2.k. i) what is the heat transfer rate per unit length of the wire at the interface between the copper and the insulating material? (i. e. i) what is the critical radius of insulation (r2c)? i) plot the temperature difference between the copper surface and ambient air as a function of the radius of insulation. show all working and attach a print out of your plot with axes labelled clearly (use values between r1 and 2 x r2c (critical radius) for the x-axis)

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

: )

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.