A coil having an area 2m2 is placed in a magnetic field
A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field
The magnetic flux through a circuit of resistance R changes by an amount Î”Î¦ in time Î”t
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
A bar magnet is placed upright on a floor
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 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..
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 straight strip has magnetic moment M. If bent as a semicircle, the magnetic moment of the strip will be
According to phenomenon of mutual inductance
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 six pole generator with fixed field excitation developes an emf of 100 V, when operating at 1500 rpm. At what speed must it rota..
A coil Having 500 square loops each of side 10cm
The figure shows three circuits with identical batteries, inductors and resistances. Rank the circuits according to the currents t..
A square loop of side 22cm is converted into circular loop in
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..
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 ?
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 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..
Lenzs law is consequence of the law of conservatian of
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..
The flux linked with a circuit is given by
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..
an lcr circuit is equivalent to a damped pendulum.in an LCR
The north pole of a long horizontal bar magnet is being brought closer
a square metal wire loop of side 10 cms
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 ..
Two concentric coils each of radius equal to
A rectangular, a square, a circular and an elliptical loop
A solenoid of inductance 2 H carries a current 1 A. What is the magnetic energy stored in a solenoid ?
According to the Faradays law of electromagnetic induction
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..
According to Lenzs law of electromagnetic induction
The number of turns in primary and secondary coils of a transformer is 50 and 200, respectively. If the current in the primary coi..
in a series lcr circuit, r =200 and the voltage and the
A susceptibility of a certain magnetic material is 400 . What is the class of the magnetic material ?
Induction furnace is based on the heating effect of
The core of a transformer is laminated to reduce
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