A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field
A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis,then
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 magnet is brought towards a coil (i) speedly (ii) slowly, then the induced e.m.f./induced charge will be respectively
The magnetic flux through a circuit of resistance R changes by an amount Î”Î¦ in time Î”t
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 bar magnet is placed upright on a floor
A Square coil of 10-2 m2 area is placed perpendicular to a uniform magnetic field of intensity
According to phenomenon of mutual inductance
According to the Faradays law of electromagnetic induction
A coil Having 500 square loops each of side 10cm
Lenzs law is consequence of the law of conservatian of
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 coil having an area 2m2 is placed in a magnetic field
A rectangular, a square, a circular and an elliptical loop
The north pole of a long horizontal bar magnet is being brought closer
According to Lenzs law of electromagnetic induction
A square loop of side 22cm is converted into circular loop in
Two concentric coils each of radius equal to
The flux linked with a circuit is given by
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
Two coils A and B have mutual inductance 2*10-2 henry. if the current in the primary is i = 5sin(10Ï€ t) then the maximum value..
A circular coil of radius R = 10cm having 500 turns and total resistance 2 is placed initially perpendicular to the earths magneti..
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 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..
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..
A solenoid of inductance 2 H carries a current 1 A. What is the magnetic energy stored in a solenoid ?
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 figure shows three circuits with identical batteries, inductors and resistances. Rank the circuits according to the currents t..
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 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 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..
The core of a transformer is laminated to reduce
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..
Curie-Weiss law is obeyed by iron
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 step-down transformer has 50 turns on secondary and 1000 turns on primary winding. If a transformer is connected to 220 V and 1 ..
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..
Susceptibility of ferromagnetic substance is
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