A step-down transformer, transforms a supply line voltage of 2200 V into 220 V. The primary coil has 5000 turns. The efficiency an..
A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis,then
If a coil of 40 turns and area 4.0 cm2 is suddenly removed from a magnetic field, it is obseverd that a charge of
A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field
The turn ratio of a transformer is 1 : 2. An electrolytic DC cell of emf 2 V is connected to its primary. The output voltage acros..
The magnetic flux linked with a coil of N turns of area of cross section A held with its plane parallel to the field B is
The magnetic flux through a circuit of resistance R changes by an amount Î”Î¦ in time Î”t
What should be the value of self inductance of an inductor that should be connected to 220 V, 50 Hz supply, so that a maximum curr..
A bar magnet is placed upright on a floor
A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transfor..
The magnetic susceptibility of a paramagnetic substance at -73 degree C is 0.0060, then its value at -173 degree C will be
In an AC generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency w in a magnetic fie..
A coil having an area 2m2 is placed in a magnetic field
A solenoid of inductance 2 H carries a current 1 A. What is the magnetic energy stored in a solenoid ?
A transformer has an efficiency of 80 per. It is connected to a power input of 5 kW at 200 V. If the secondary voltage is 250 V, t..
A paramagnetic liquid is taken in a U-tube and arranged so that, one of its limbs is kept between pole pieces of the magnet. The l..
A six pole generator with fixed field excitation developes an emf of 100 V, when operating at 1500 rpm. At what speed must it rota..
The figure shows three circuits with identical batteries, inductors and resistances. Rank the circuits according to the currents t..
A copper disc of radius 0.1 m is rotated about its centre with 20 rev/s in an uniform magnetic field of 0.1 T with its plane perpe..
A coil Having 500 square loops each of side 10cm
Magnetic flux of 10 u Wb is linked with a coil, when a current of 2mA flows through it. What is the self inductance of the coil ?
Turn ratio is 1.25. The step-up transformer operates at 230 V and current through secondary is 2 A. Then, current in primary is
A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency of transfor..
In 0.1s, the current in a coil increases from 1 A to 1.5 A. If inductance of coil is 60 mH, then induced current in external resis..
A square loop of side 22cm is converted into circular loop in
According to phenomenon of mutual inductance
A copper ring is held horizontally and a bar magnet is dropped through the ring with its lenth along the axis of the ring
A step-down transformer has 50 turns on secondary and 1000 turns on primary winding. If a transformer is connected to 220 V and 1 ..
Lenzs law is consequence of the law of conservatian of
The flux linked with a circuit is given by
A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V circuit. The ratio of turns in the windings of..
A rectangular, a square, a circular and an elliptical loop
an lcr circuit is equivalent to a damped pendulum.in an LCR
According to the Faradays law of electromagnetic induction
The time period of a freely suspended bar magnet in a field is 2s. It is cut into two equal parts along its axis, then the time pe..
Two concentric coils each of radius equal to
The north pole of a long horizontal bar magnet is being brought closer
The number of turns in primary and secondary coils of a transformer is 50 and 200, respectively. If the current in the primary coi..
According to Lenzs law of electromagnetic induction
A straight strip has magnetic moment M. If bent as a semicircle, the magnetic moment of the strip will be
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