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state the factors that affect the capacitance of a parallel plate capacitor and explain how the variation of each of
three capacitors of 6 muf 8 muf and 10 muf respectively are connected in parallel across a 60 v supply calculatea the
in the circuit of fig 333 the variable capacitor is set to 60 f determine the pd across this capacitor if the supply
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
1 a magnetising coil of 850 turns carries a current of 25 ma determine the resulting mmf2 it is required to produce an
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
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
a 50 pf capacitor is made up of two plates separated by a dielectric 2 mm thick and of relative permittivity 14
two capacitors of 4 muf and 6 muf are connected in series across a 250 v supplya calculate the charge and pd across
for the circuit shown in fig 334 the total capacitance is 16 pf calculatea the value of the unmarked capacitorb the
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