A rod of length l and area of cross section A with thermally insulated lateral surface consists of a material whose heat conductivity coefficient varies with temperature as k=α/T, where α is a constant. The ends of the rod are kept at temperatures T1 and T2 (T1>T2). Find the rate of heat flow across the rod at distance x from the end whose temperature is T1.
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Focal Length - The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a 'Real image' of a distant object at its focus, as shown in the figure.
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