Physics, 17.04.2020 00:14 anthonybowie99
Which of the following statements is true? A. electric field lines stay inside equipotent surfaces B. equipotent surfaces intersect in straight lines C. equipotent surfaces intersect in curved lines D. electric field lines are perpendicular to equipotent surfaces E. equipotent surfaces are parallel to each other
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Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?
Answers: 2
Which of the following statements is true? A. electric field lines stay inside equipotent surfaces B...
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