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1 a conductor of effective length 05 m is placed at right angles to a magnetic field of density 045 t calculate the
1 a coil of 15 000 turns is required to produce an emf of 15 kv determine the rate of change of flux that must link
1 when a magnetic flux linking a coil changes an emf is induced in the coil explain the factors that determinea the
a closed magnetic circuit made from silicon steel consists of two sections connected in series one is of effective
1 a flux of 15 mwb linking with a 250 turn coil is uniformly reversed in a time of 002 s calculate the value of the emf
1 the flux linking a 600 turn coil changes uniformly from 100 mwb to 50 mwb in a time of 85 ms calculate the average
a magnetic circuit of csa 045 cm 2 consists of one part 4 cm long and mur of 1200 and a second part 3 cm long and mur
a circular toroid of mean diameter 25 cm and csa 4 cm 2 has a 15 mm air gap in it the toroid is wound with a 1200 turn
a magnetic circuit made of radiometal is subjected to a magnetic field strength of 5000 atm using the data given in fig
a cast steel toroid has the following b h data complete the data table for the corresponding values of mur and hence
a toroid of mean radius 35 mm effective csa 4 cm2 and relative permeability 200 is wound with a 1000 turn coil that
1 an air-cored coil contains a flux density of 25 mt when an iron core is inserted the flux density is increased to 16
1 calculate the current required in a 500 turn coil to produce an electric field strength of 4000 atm in an iron
1 a 41 voltage lsquo step-down transformer is connected to a 110 v ac supply if the current drawn from this supply is
1 sketch the circuit symbol for a transformer and explain its principle of operation why is the core made from
the mutual inductance between the two windings of a car ignition coil is 5 h calculate the average emf induced in the
two coils of self-inductance 50 mh and 85 mh respectively are placed parallel to each other if the coupling coefficient
two air-cored coils a and b are wound with 100 and 500 turns respectively a current of 5 a in a produces a flux of 15
a coil of 5000 turns is wound on to a nonmagnetic toroid of csa 100 cm2 and mean circumference 05 m a second coil of
1 when the current in a coil changes from 2 a to 12 a in a time of 150 ms the emf induced into an adjacent coil is 8 v
an iron ring of mean length 50 cm and csa 08 cm2 is wound with a coil of 350 turns a current of 05 a through the coil
1 calculate the self-inductance of a 700 turn coil if a current of 5 a fl owing through it produces a flux of 8 mwb2 a
1 explain what is meant by the term lsquo loading effect 2 a voltmeter having a figure of merit of 15 k omega volt has
for the meter movement described in question 19 above show how it may be adapted to serve as a voltmeter with voltage
1 the magnetic flux density at a distance of 14 m from the centre of a current carrying conductor is 025 mt determine