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A silicon iron ring is wound with 800 turns, the ring having a mean diameter of 120mm and a cross-sectional area of 400mm2.
If when carrying a current of 0.5 A the relative permeability is found to be 3000, calculate
(a) the self inductance of the coil,
(b) the induced e.m.f. if the current is reduced to zero in 80ms.
A cue ball has a mass of 0.160 kg is at rest on a frictionless pool table. The ball is hit dead center by a pool stick which applies an impulse of +1.40 Ns to the ball. He ball the
Construction: A motor require essentially a rectangular coil called armature a permanent magnet, a device called commutator to reverse the direction of current and a source of ele
Q. What are the various energy losses of a transformer? Energy losses in a transformer: (a) Hysteresis loss (b Copper loss (c) Eddy current loss (Iron loss) (d)
What is the proper formula used to calculate acceleration? There are a few. The most famous is a = F/m, where F is the net force applied to a mass, m. Acceleration is also the
An unknown material has a normal melting/freezing point of -26.3° C, and the liquid phase has a specific heat capacity of 160 J/(kg · C°). One-tenth of a kilogram of the solid at -
A boat can travel at a speed of 3 m s -1 on still water. A boatman needs to cross a river whilst covering the shortest possible distance. In what direction should he row with resp
A plane diffraction grating of width 2.5cm has 1500 rulings. Monochromatic light of wave length 5893A 0 is incident normally on it. Determine the angle at which second order princ
Van der Waals force (J.D. van der Waals): It is the forces which is responsible for the non-ideal behavior of gases, & lattice energy of molecular crystals. There are three ca
A car of mass 1600 kilograms (kg) was travelling at 30m/s when the brakes were applied and produced a constant retarding force of 8000 N (Newtons) to the car: Find - a) How far the
composition of two simple harmonic motions at right angles to each other and having time periods in the ratio 1:2
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