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a 4 muf capacitor is charged to a pd of 400 v and then connected across an uncharged 2 muf capacitor calculatea the
when a capacitor is connected across a 200 v supply it takes a charge of 8 muc calculatea its capacitanceb the energy
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
1 determine the value of capacitor which when connected in series with a 2 nf capacitor produces a total capacitance of
1 capacitors of 4 f and 10 f are connected a in parallel and b in series calculate the equivalent capacitance in each
a capacitor is to be designed to have a capacitance of 47 pf and to operate with a pd of 120 v across its terminals the
figure 544 represents two of the armature conductors of a dc generator rotating in a clockwise direction copy this
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
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