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1 130000-yd3 of banked soil from a borrow pit is stockpiled before being trucked to the jobsite the soil has 18 swell and shrinkage of 8 the
magnetic field due to an electric current let a piece of wire be arranged to pass vertically by a horizontal sheet of cardboard on which is
hysteresis results in a dissipation of energy hysteresis results in a dissipation of energy which appears as a heating of the magnetic material the
define hysteresishysteresis is the lagging effect of flux density b whenever there are changes in the magnetic field strength h when an initially
a closed magnetic circuit of cast steel having a 6cm long path of cross-sectional area 1cm2 and a 2 cm path of cross-sectional area 05 cm2 a coil of
permeability and b-h curve for different magnetic materialspermeability is the ability of a magnetic circuit to create magnetic flux lines in a
magnetic flux and flux densitymagnetic flux is the amount of the magnetic field or the number of lines of force formed by a magnetic source the
characteristics of magnetic field flux linesi forming a closing loopii did not crossed against each otheriii has a certain directioniv repel
the magnetic fields can be plot by usingi compassii iron dust method
define magnetic fieldthe area around a magnet is known as the magnetic field and it is in this area that the effects of the magnetic force formed by
what is the direction of a line of fluxthe direction of a line of flux is from the north pole to the south pole on the exterior of the magnet and is
define permanent magneta permanent magnet is a piece of ferromagnetic material like as iron nickel or cobalt which has properties of attracting
definition of magnetism magnetism is explained as the force produced by charge particles electrons of magnet a magnet is a material that obtained
the field winding of a 200 v dc machine has a resistance of 20 and an inductance of 500mhcalculatea the time constant of the field windingb
a coil has an inductance of 12h and a resistance of 40 and is connected to a 200 v dc supply verify the approximate value of the current flowing 60
the winding of an electromagnet has an inductance of 3h and a resistance of 15 when it is connected to a 120 v dc supply determinea the steady
a coil of inductance 004 h and resistance 10 is connected to a 120 v dc supply verifya the final value of current b the time
one circuit has resistor 40 connected in series with inductor 15h and dc voltage 220vcalculatei time constantii current at time iiii
time constant at decay of currentin decay of current by an inductor a method to find values of time constant similar as in rise of current through an
time constanttime constant defines as time for current achieve maximum im if this maintain the early promotion rate
factors which affect the inductance of an inductor include i the number of turns of wire n - more turns the higher the inductanceii the
self-inductance and the induced emfinductance is the name given to the property of a circuit whereby there is an emf induced into the circuit by
mathematical relationship between the induced emf and the networkfaraday noted that the emf induced in a loop is proportional to the rate of change
faradays lawfaradays laws of electromagnetic induction statei an induced emf is setup when the magnetic field linking that circuit changesii
circuit with inductive load electromagnetic inductionwhen a conductor is moved across a magnetic field so as to cut by the lines of force or flux