A single layer of No. 24 AWG (dia=0.0201 in) commercial iron wire is wound over a ceramic tube whose diameter is 3.25 in. if the total wire resistance is 41 ohms, determine the number of turns.
1. A coil of annealed copper wire has 820 turns, the average length of which is 9 in. If the diameter of the wire is 32 mils, calculate the total resistance of the coil at 200C.
An oil film of thickness 0.12 micrometer rests on a pool of water. If a ray strikes the film at an angle of 60°,what is the wavelength reflected in the first order?