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1). A ring of outer diameter 80 cm is made from square of cross -section steel bar size(8 *8 cm) . If relative permeability 1200 for steel . calculate the current needed to produce the flux of 4 mili weber in the steel . In a coil of 600 turns wound on the core .what is the flux density and magnetizing force H?
2) A rectangular transformer core is made with silicon steel with area 30 cm square and mean length 1.25 metre and air gap of 8 mm is cut on the core .Given that leakage co-efficient is 1.25 and relative permeability is 1500.Caculate the number of turns needed in the exisisting coil which carries a current of 3 ampere to produce a flux density 1.5 tesla in a airgap?
A ball dropped from a balloon at rest clears a tower 81m high during the last quater second of its journey. Find the height of the balloon and the velocity of the body when it rea
When two dissimilar sound rays of slightly different frequencies, traveling in a phase along the same direction, superimpose on one other, the intensity of the resultant sound at a
describe the applications of potentiometers
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Helium gas with a volume of 2.60 L, under a pressure of 1.30atm and at a temperature of 41.0 degrees, is warmed until both pressure and volume are doubled. a)What is the final temp
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For the magnetic circuit shown in Figure find the current I in the coil needed to produce a flux of 0.45mWb in the air gap. The silicon iron magnetic circuit has a uniform cros
Two cars head out in the similar direction. Car A starts 1.0 min before car B. The position-time graphs for both cars are shown in the accompanying figure. a. How far apa
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