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1 a 20 muf capacitor is charged to a pd of 250 v calculate the energy stored2 the energy stored by a 400 pf capacitor
when a capacitor is connected across a 200 v supply it takes a charge of 8 muc calculatea its capacitanceb the energy
two capacitors of 4 muf and 6 muf are connected in series across a 250 v supplya calculate the charge and pd across
a ceramic capacitor is to be made so that it has a capacitance of 100 pf and is to be operated from a 750 v supply
1 the pole faces of a magnet are 4 cm 3 cm and produce a flux of 05 mwb calculate the flux density2 a flux density of
1 a magnetising coil of 850 turns carries a current of 25 ma determine the resulting mmf2 it is required to produce an
1 a toroid has an mmf of 845 at applied to it if the mean length of the toroid is 15 cm determine the resulting
a magnetic circuit made of radiometal is subjected to a magnetic field strength of 5000 atm using the data given in fig
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 closed magnetic circuit made from silicon steel consists of two sections connected in series one is of effective
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
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
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
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
1 a coil has 300 turns and an inductance of 5 mh how many turns would be required to produce an inductance of 08 mh if
1 when a current of 25 a flows through a 05 h inductor the flux produced is 80 wb determine the number of turns2 a 1000
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
a moving coil meter has a coil of 60 turns wound on to a former of effective length 225 mm and diameter 15 mm if the
the coil of a moving coil meter is wound with 75 turns on a former of effective length 25 cm and diameter 2 cm the
1 a conductor when placed at right angles to a magnetic field of density 700 mt experiences a force of 20 mn when
figure 544 represents two of the armature conductors of a dc generator rotating in a clockwise direction copy this
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