A magnet is brought towards a coil (i) speedly (ii) slowly, then the induced e.m.f./induced charge will be respectively
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
The magnetic flux through a circuit of resistance R changes by an amount Î”Î¦ in time Î”t
A Square coil of 10-2 m2 area is placed perpendicular to a uniform magnetic field of intensity
A bar magnet is placed upright on a floor
According to the Faradays law of electromagnetic induction
According to phenomenon of mutual inductance
Lenzs law is consequence of the law of conservatian of
A coil Having 500 square loops each of side 10cm
A copper ring is held horizontally and a bar magnet is dropped through the ring with its lenth along the axis of the ring
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
A coil having an area 2m2 is placed in a magnetic field
Two concentric coils each of radius equal to
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 rectangular, a square, a circular and an elliptical loop
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 flux linked with a circuit is given by
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 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 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..
The figure shows three circuits with identical batteries, inductors and resistances. Rank the circuits according to the currents t..
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 ?
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..
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..
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 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..
The core of a transformer is laminated to reduce
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 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..
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
Induction furnace is based on the heating effect of
A circular coil of radius R = 10cm having 500 turns and total resistance 2 is placed initially perpendicular to the earths magneti..
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 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..
Susceptibility of ferromagnetic substance is
Curie-Weiss law is obeyed by iron
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